15th Reconnaissance Squadron
Encyclopedia
15th Reconnaissance Squadron (15 RS) flies MQ-1 Predator UAV
Unmanned aerial vehicle
An unmanned aerial vehicle , also known as a unmanned aircraft system , remotely piloted aircraft or unmanned aircraft, is a machine which functions either by the remote control of a navigator or pilot or autonomously, that is, as a self-directing entity...

's and is currently stationed at Creech Air Force Base
Creech Air Force Base
Creech Air Force Base , formerly known as Indian Springs Air Force Auxiliary Field, is a United States Air Force base located one mile north of the central business district of Indian Springs, in Clark County, Nevada, United States. It is about northwest of Las Vegas and northwest of Nellis Air...

 in Indian Springs
Indian Springs, Nevada
Indian Springs is an unincorporated town in Clark County, Nevada, United States. The population was 1,302 at the 2000 census.-History:Indian Springs is named for the artesian spring that provides the area with water...

, Nevada
Nevada
Nevada is a state in the western, mountain west, and southwestern regions of the United States. With an area of and a population of about 2.7 million, it is the 7th-largest and 35th-most populous state. Over two-thirds of Nevada's people live in the Las Vegas metropolitan area, which contains its...

. The 15th Reconnaissance Squadron is one of the first armed Remotely Piloted Aircraft (RPA) squadrons. The squadron provides combatant commanders with persistent ISR, full-motion video, and precision weapons employment. Global operations architecture supports continuous MQ-1B Predator employment providing real-time actionable intelligence, strike, interdiction, close air support, and special missions to deployed war fighters.

History

The unit traces its history back to May 9, 1917, The Aviation Section, U.S. Signal Corps, redesignated the unit as the 15th Aero Squadron on Aug. 22, 1917. Flying such historic aircraft as the Curtis "Jenny" JN-4 biplane, the squadron served as a flying training unit between 1917-1919. After a short stint on the inactive list and a series of organizational changes, the unit emerged as the 15th Observation Squadron on Jan. 25, 1923. This began a varied and unending string of intelligence, surveillance, and reconnaissance roles for the unit that stretched over more than eight decades. it was reactivated on August 1, 1997, at Indian Springs Air Force Auxiliary Field under command of the 57th Operations Group
57th Operations Group
The 57th Operations Group is a non-flying component of the 57th Wing, assigned to the United States Air Force's Air Combat Command. The group is stationed at Nellis Air Force Base, Nevada.-Overview:...

, 57th Wing
57th Wing
The 57th Wing is an operational unit of the United States Air Force Warfare Center, stationed at Nellis Air Force Base, Nevada.The 57 WG's mission is to provide well trained and well equipped combat forces ready to deploy into a combat arena to conduct integrated combat operations.-Mission:The 57...

.

During the Vietnam era the 15th Tactical Reconnaissance Squadron was based at Kadena Air Base, Japan, flying the RF-101. The unit had many deployments to Southeast Asia, flying reconnaissance missions in support of US combat operations in that theatre.

From July 2005 to June 2006, the 15th Reconnaissance Squadron participated in more than 242 separate raids; engaged 132 troops in contact-force protection actions; fired 59 Hellfire missiles; surveyed 18,490 targets; escorted four convoys; and flew 2,073 sorties for more than 33,833 flying hours.

Starting in 2005, the unit trained California Air National Guard
California Air National Guard
The California Air National Guard is the air component of the California National Guard. The California Air National Guard is headquartered at Sacramento, California.One of the duties of the California Air National Guard is defense of the United States...

's 163d Reconnaissance Wing
163d Reconnaissance Wing
The 163d Reconnaissance Wing is a wing of the United States Air Force located at March Joint Air Reserve Base, California. It is a component of the California Air National Guard, and is one of the first ANG units to fly the MQ-1 Predator...

 members to operate the MQ-1.The 163d is being retasked as an MQ-1 unit.

Lineage

  • Organized as 2d Aviation School Squadron on 9 May 1917
Redesignated 15th Aero Squadron on 22 Aug 1917
Demobilized on 18 Sep 1919
  • Reconstituted, and consolidated (1924) with 15th Squadron (Observation)
Authorized on 30 Aug 1921
Organized on 21 Sep 1921
Redesignated 15th Observation Squadron on 25 Jan 1923
Inactivated on 1 Aug 1927
  • Activated on 15 May 1928
Redesignated: 15th Observation Squadron (Medium) on 13 Jan 1942
Redesignated: 15th Observation Squadron on 4 Jul 1942
Redesignated: 15th Reconnaissance Squadron (Fighter) on 2 Apr 1943
Redesignated: 15th Tactical Reconnaissance Squadron on 11 Aug 1943
Inactivated on 31 Mar 1946
  • Activated on 3 Dec 1947
Inactivated on 1 Apr 1949
  • Redesignated 15th Tactical Reconnaissance Squadron, Photo-Jet on 5 Feb 1951
Activated on 25 Feb 1951
  • Redesignated 15th Tactical Reconnaissance Squadron on 8 Oct 1966
Inactivated on 1 Oct 1990
  • Redesignated 15th Tactical Intelligence Squadron on 20 Feb 1991
Activated on 15 Mar 1991
Redesignated 15th Air Intelligence Squadron on 13 Apr 1992
Inactivated on 1 Jun 1994
  • Redesignated 15th Reconnaissance Squadron on 31 Jul 1997
Activated on 1 Aug 1997.

Assignments

  • Unknown, 1917-1919 (but possibly Aeronautical [later, Air] Division, Signal Corps, 9 May 1917
  • Training Section, Department of Military Aeronautics, Signal Corps, 24 Apr 1918
  • Operations Section, Department of Military Aeronautics, Signal Corps, 9 Jul 1918
  • Training and Operations Group, Air Service, 29 Jan-18 Sep 1919
  • Sixth Corps Area, 21 Sep 1921
  • 6th Division, Air Service, 24 Mar 1923
Attached to Sixth Corps Area, 24 Mar 1923-Jun 1927
  • Sixth Corps Area, Jun-1 Aug 1927
  • 6th Division, Air Service (later, 6 Division, Aviation), 15 May 1928
Attached to Sixth Corps Area, 15 May 1928-
  • 14th Observation Group, 8 May 1929
Remained attached to Sixth Corps Area
  • 12th Observation Group, 1937-Jul 1938
Remained attached to Sixth Corps Area
  • Unknown, Jul 1938
Remained attached to Sixth Corps area to c. 9 Jan 1941
Detachment operated at Field Artillery School, 1 Dec 1940-c. 9 Jan 1941
  • Field Artillery School, c. 9 Jan 1941
  • III Air Support Command, 1 Sep 1941
Attached to Field Artillery School, 1 Sep 1941-
Further attached to 68th Observation Group, 12 Dec 1941-2 Feb 1942
  • 73d Observation (later, 73 Reconnaissance; 73 Tactical Reconnaissance; 10 Photographic) Group, 12 Mar 1942
Remained attached to Field Artillery School to 1 Apr 1942
  • Ninth Air Force
    Ninth Air Force
    The Ninth Air Force is a numbered air force of the United States Air Force's Air Combat Command . It is headquartered at Shaw Air Force Base, South Carolina....

    , 22 Dec 1943
Attached to 67th Tactical Reconnaissance Group, 22 Dec 1943-
  • IX Fighter Command
    IX Fighter Command
    The IX Fighter Command is an inactive United States Army Air Force unit. Its last assignment was with the Ninth Air Force, based at Erlangen, Germany. It was inactivated on 16 November 1945....

    , 30 Dec 1943
Remained attached to 67th Tactical Reconnaissance Group
  • 67th Tactical Reconnaissance Group, 4 Jan 1944
Attached to IX [later, XIX] Air Support Command, 4 Jan 1944-c. 16 Mar 1944
  • 10th Photographic Group, Reconnaissance (later, 10 Reconnaissance Group), 13 Jun 1944
Attached to IX Tactical Air Command
IX Tactical Air Command
The IX Tactical Air Command is an inactive United States Air Force unit. Its last assignment was with the Ninth Air Force, based at Camp Shanks, New York...

, 13-27 Jun 1944
Flight attached to 67th Tactical Reconnaissance Group, 3-12 Aug 1944
  • United States Strategic Air Forces in Europe, 24 Jun 1945
  • Third Air Force
    Third Air Force
    The Third Air Force is a numbered air force of the United States Air Forces in Europe . It is headquartered at Ramstein Air Base, Germany....

    , 3 Aug 1945
  • First Air Force
    First Air Force
    The First Air Force is a numbered air force of the United States Air Force Air Combat Command . It is headquartered at Tyndall Air Force Base, Florida....

    , 3 Feb 1946
  • Tactical Air Command
    Tactical Air Command
    Tactical Air Command is an inactive United States Air Force organization. It was a Major Command of the United States Air Force, established on 21 March 1946 being headquartered at Langley Air Force Base, Virginia...

    , 21-31 Mar 1946
  • 10th Reconnaissance (later, 10th Tactical Reconnaissance) Group, 3 Dec 1947-1 Apr 1949
Attached to 363d Reconnaissance Group, 22 Aug-3 Nov 1948
  • 67th Tactical Reconnaissance Group, 25 Feb 1951
Attached to 67th Tactical Reconnaissance Wing, 1 Jun-c. 25 Nov 1954 and 1 Jul-1 Oct 1957
  • 67th Tactical Reconnaissance Wing, 1 Oct 1957
Attached to 18th Tactical Fighter Wing, 15 Mar 1960-
  • 13th Air Division, 25 Apr 1960
Remained attached to 18th Tactical Fighter Wing to 20 Apr 1970
  • 18th Tactical Fighter Group, 1 May 1978
  • 18th Tactical Fighter Wing, 11 Feb 1981
  • 460th Tactical Reconnaissance Group, 1 Oct 1989-1 Oct 1990
  • 548th Reconnaissance Technical Group, 15 Mar 1991
  • Pacific Air Forces, 3 Jul 1991
  • 15th Operations Group
    15th Operations Group
    The 15th Operations Group is the flying component of the 15th Wing, assigned to the United States Air Force Thirteenth Air Force. The group is stationed at Hickam Air Force Base, Hawaii....

    , 13 Apr 1992-1 Jun 1994
  • 57th Operations Group
    57th Operations Group
    The 57th Operations Group is a non-flying component of the 57th Wing, assigned to the United States Air Force's Air Combat Command. The group is stationed at Nellis Air Force Base, Nevada.-Overview:...

    , 1 Aug 1997-Present

Stations

  • Hazelhurst Field, New York
    New York
    New York is a state in the Northeastern region of the United States. It is the nation's third most populous state. New York is bordered by New Jersey and Pennsylvania to the south, and by Connecticut, Massachusetts and Vermont to the east...

    , 9 May 1917 - 18 September 1919. (Unit demobilized)
  • Chanute Field, Illinois
    Illinois
    Illinois is the fifth-most populous state of the United States of America, and is often noted for being a microcosm of the entire country. With Chicago in the northeast, small industrial cities and great agricultural productivity in central and northern Illinois, and natural resources like coal,...

    , 21 September 1921.
  • Kelly Field, Texas
    Texas
    Texas is the second largest U.S. state by both area and population, and the largest state by area in the contiguous United States.The name, based on the Caddo word "Tejas" meaning "friends" or "allies", was applied by the Spanish to the Caddo themselves and to the region of their settlement in...

    , (day unknown) June - 1 August 1927. (Unit inactivated)
  • Selfridge Field
    Selfridge Field
    Selfridge Air National Guard Base or Selfridge ANGB is an Air National Guard installation located in Harrison Township, Michigan, near Mount Clemens.-Units and organizations:...

    , Michigan
    Michigan
    Michigan is a U.S. state located in the Great Lakes Region of the United States of America. The name Michigan is the French form of the Ojibwa word mishigamaa, meaning "large water" or "large lake"....

    , 15 May 1928. (Deployed to Camp McCoy, Wisconsin, 24 September - 28 October 1928
  • Camp Skeel, Michigan
    Michigan
    Michigan is a U.S. state located in the Great Lakes Region of the United States of America. The name Michigan is the French form of the Ojibwa word mishigamaa, meaning "large water" or "large lake"....

    , 28–31 October 1928
  • Fort Sheridan, Illinois
    Illinois
    Illinois is the fifth-most populous state of the United States of America, and is often noted for being a microcosm of the entire country. With Chicago in the northeast, small industrial cities and great agricultural productivity in central and northern Illinois, and natural resources like coal,...

    , 8–11 June 1930
  • Bowman Field, Kentucky, 14–27 June 1930.)
  • Scott Field
    Scott Air Force Base
    Scott Air Force Base is a base of the United States Air Force in St. Clair County, Illinois, near Belleville.-Overview:The base is named after Corporal Frank S. Scott, the first enlisted person to be killed in an aviation crash...

    , Illinois
    Illinois
    Illinois is the fifth-most populous state of the United States of America, and is often noted for being a microcosm of the entire country. With Chicago in the northeast, small industrial cities and great agricultural productivity in central and northern Illinois, and natural resources like coal,...

    , circa 28 June 1930. (Detachment at Post Field, Oklahoma, circa 1 December 1940 - 9 January 1941.)
  • Post Field, Oklahoma
    Oklahoma
    Oklahoma is a state located in the South Central region of the United States of America. With an estimated 3,751,351 residents as of the 2010 census and a land area of 68,667 square miles , Oklahoma is the 28th most populous and 20th-largest state...

     9 January 1941.
  • Ellington Field
    Ellington Field
    Ellington International Airport is a joint civil-military airport located in the U.S. state of Texas within the city of Houston— southeast of Downtown. Established by the Army Air Service on 21 May 1917, Ellington Field was one of the initial World War I Army Air Service installations when...

    , Texas
    Texas
    Texas is the second largest U.S. state by both area and population, and the largest state by area in the contiguous United States.The name, based on the Caddo word "Tejas" meaning "friends" or "allies", was applied by the Spanish to the Caddo themselves and to the region of their settlement in...

    , 16 December 1941. (Flight at Post Field, Oklahoma, December 1941 - April 1942)
  • Godman Field, Kentucky
    Kentucky
    The Commonwealth of Kentucky is a state located in the East Central United States of America. As classified by the United States Census Bureau, Kentucky is a Southern state, more specifically in the East South Central region. Kentucky is one of four U.S. states constituted as a commonwealth...

    , 23 April 1942.
  • Camp Campbell Army Airfield. Kentucky
    Kentucky
    The Commonwealth of Kentucky is a state located in the East Central United States of America. As classified by the United States Census Bureau, Kentucky is a Southern state, more specifically in the East South Central region. Kentucky is one of four U.S. states constituted as a commonwealth...

    , 26 June 1942.
  • Key Field
    Key field
    A key field is a field or set of fields of a database table which together form a unique identifier for a database record . The aggregate of these fields is usually referred to simply as "the key". Key fields also define searches...

    , Mississippi
    Mississippi
    Mississippi is a U.S. state located in the Southern United States. Jackson is the state capital and largest city. The name of the state derives from the Mississippi River, which flows along its western boundary, whose name comes from the Ojibwe word misi-ziibi...

    , 6 November - 4 December 1943.
  • RAF Aldermaston
    RAF Aldermaston
    RAF Aldermaston was a World War II airfield. It was used by the Royal Air Force and the United States Army Eighth and Ninth Air Force as a troop carrier group base, and was assigned USAAF station No 467.-Origins:...

     (AAF-467), England
    England
    England is a country that is part of the United Kingdom. It shares land borders with Scotland to the north and Wales to the west; the Irish Sea is to the north west, the Celtic Sea to the south west, with the North Sea to the east and the English Channel to the south separating it from continental...

    , 22 December 1943.
  • RAF Chilbolton
    RAF Chilbolton
    RAF Station Chilbolton is a former World War II airfield in Hampshire, England. The airfield is located approximately south-southeast of Andover; about southwest of London...

     (AAF-404), England
    England
    England is a country that is part of the United Kingdom. It shares land borders with Scotland to the north and Wales to the west; the Irish Sea is to the north west, the Celtic Sea to the south west, with the North Sea to the east and the English Channel to the south separating it from continental...

    , 1 March 1944.
  • RAF Middle Wallop (AAF-449), England
    England
    England is a country that is part of the United Kingdom. It shares land borders with Scotland to the north and Wales to the west; the Irish Sea is to the north west, the Celtic Sea to the south west, with the North Sea to the east and the English Channel to the south separating it from continental...

    , 16 March 1944.
  • RAF Chalgrove (AAF-465), England
    England
    England is a country that is part of the United Kingdom. It shares land borders with Scotland to the north and Wales to the west; the Irish Sea is to the north west, the Celtic Sea to the south west, with the North Sea to the east and the English Channel to the south separating it from continental...

    , 27 June 1944.
  • Rennes Airfield (A-27), France
    France
    The French Republic , The French Republic , The French Republic , (commonly known as France , is a unitary semi-presidential republic in Western Europe with several overseas territories and islands located on other continents and in the Indian, Pacific, and Atlantic oceans. Metropolitan France...

    , 10 August 1944.
  • Châteaudun Airfield (A-39), France
    France
    The French Republic , The French Republic , The French Republic , (commonly known as France , is a unitary semi-presidential republic in Western Europe with several overseas territories and islands located on other continents and in the Indian, Pacific, and Atlantic oceans. Metropolitan France...

    , 26 August 1944.
  • Saint-Dizier Airfield (A-64), France
    France
    The French Republic , The French Republic , The French Republic , (commonly known as France , is a unitary semi-presidential republic in Western Europe with several overseas territories and islands located on other continents and in the Indian, Pacific, and Atlantic oceans. Metropolitan France...

    , 9 September 1944.
  • Conflans Airfield (Y-94), France
    France
    The French Republic , The French Republic , The French Republic , (commonly known as France , is a unitary semi-presidential republic in Western Europe with several overseas territories and islands located on other continents and in the Indian, Pacific, and Atlantic oceans. Metropolitan France...

    , 1 December 1944.
  • Trier Airfield (Y-57), Germany
    Germany
    Germany , officially the Federal Republic of Germany , is a federal parliamentary republic in Europe. The country consists of 16 states while the capital and largest city is Berlin. Germany covers an area of 357,021 km2 and has a largely temperate seasonal climate...

    , 14 March 1945

  • Ober Olm Airfield (Y-64), Germany
    Germany
    Germany , officially the Federal Republic of Germany , is a federal parliamentary republic in Europe. The country consists of 16 states while the capital and largest city is Berlin. Germany covers an area of 357,021 km2 and has a largely temperate seasonal climate...

    , 3 April 1945.
  • Erfurt/Bindersleben Airfield (R-9), Germany
    Germany
    Germany , officially the Federal Republic of Germany , is a federal parliamentary republic in Europe. The country consists of 16 states while the capital and largest city is Berlin. Germany covers an area of 357,021 km2 and has a largely temperate seasonal climate...

    , 16 April 1945.
  • Fürth Airfield
    Fürth Airfield
    Fürth Airfield is a former military airfield located in Germany about 2 miles north-northeast of Fürth ; approximately 200 miles south-southwest of Berlin.The airffield was used during World War II by the German Luftwaffe as a combat airfield...

     (R-28), Germany
    Germany
    Germany , officially the Federal Republic of Germany , is a federal parliamentary republic in Europe. The country consists of 16 states while the capital and largest city is Berlin. Germany covers an area of 357,021 km2 and has a largely temperate seasonal climate...

    , 24 April 1945.
  • Reims
    Reims
    Reims , a city in the Champagne-Ardenne region of France, lies east-northeast of Paris. Founded by the Gauls, it became a major city during the period of the Roman Empire....

    , France
    France
    The French Republic , The French Republic , The French Republic , (commonly known as France , is a unitary semi-presidential republic in Western Europe with several overseas territories and islands located on other continents and in the Indian, Pacific, and Atlantic oceans. Metropolitan France...

    , 23 June – 13 July 1945.
  • Drew Field, Florida
    Florida
    Florida is a state in the southeastern United States, located on the nation's Atlantic and Gulf coasts. It is bordered to the west by the Gulf of Mexico, to the north by Alabama and Georgia and to the east by the Atlantic Ocean. With a population of 18,801,310 as measured by the 2010 census, it...

    , 3 August 1945.
  • MacDill Field, Florida
    Florida
    Florida is a state in the southeastern United States, located on the nation's Atlantic and Gulf coasts. It is bordered to the west by the Gulf of Mexico, to the north by Alabama and Georgia and to the east by the Atlantic Ocean. With a population of 18,801,310 as measured by the 2010 census, it...

    , 21 December 1945.
  • Shaw Field, South Carolina]], 3 February - 31 March 1946. (Unit inactivated)
  • Pope Field (later, Pope AFB), North Carolina
    North Carolina
    North Carolina is a state located in the southeastern United States. The state borders South Carolina and Georgia to the south, Tennessee to the west and Virginia to the north. North Carolina contains 100 counties. Its capital is Raleigh, and its largest city is Charlotte...

    , 3 December 1947 - 1 April 1949. (Unit activated) (Deployed to Lawson AFB, Georgia, 22 August - (day unknown) September 1948; Turner AFB, Georgia, September 1948; and Eglin Air Force Auxiliary Field No. 3, Florida, (day unknown) October - 3 November 1948.)
  • Komaki, Japan
    Japan
    Japan is an island nation in East Asia. Located in the Pacific Ocean, it lies to the east of the Sea of Japan, China, North Korea, South Korea and Russia, stretching from the Sea of Okhotsk in the north to the East China Sea and Taiwan in the south...

    , 25 February 1951. (operated from Taegu AB, Republic of Korea)
  • Taegu AB, Republic of Korea, 16 March 1951.
  • Kimpo AB, Republic of Korea, 23 August 1951.
  • Komaki AB, Japan, 2 March 1954.
  • Yokota AB, Japan, 25 August 1955.
  • Kadena AB, Okinawa (later, Japan), 18 August 1956. (deployed to Osan AB, Republic of Korea, 26 January - 12 February 1968; and Itazuki AB, Japan, 13 February - circa 25 July 1968.)
  • Taegu AB, Republic of Korea, 1 October 1989 - 1 October 1990. (Unit inactivated)
  • Hickam AFB, Hawaii, 15 March 1991 - 1 June 1994. (Unit inactivated)
  • Indian Springs Aux Field (now Creech AFB), Nevada
    Nevada
    Nevada is a state in the western, mountain west, and southwestern regions of the United States. With an area of and a population of about 2.7 million, it is the 7th-largest and 35th-most populous state. Over two-thirds of Nevada's people live in the Las Vegas metropolitan area, which contains its...

    , 1 Aug 1997-Present


Aircraft

  • JN-4
  • JN-6
  • DH-4 during period 1917-1919.
  • In addition to DH-4 and O-2, included JN-4, JN-6, JNS-1, and apparently M-1 during 1921-1927. * O-2, 1928–1930
  • O-19, 1930-c. 1938; O-46, 1936-c. 1939
  • O-47, 1939–1942, included O-43, O-49, and O-52 during part of this period; included A-20, P-39, P-40, and P-51, 1942–1943;
  • included Spitfire, L-4, and L-5 during 1943-1944; P-51/F-6, 1944-1945.
  • P-51/F-6, 1947–1948
  • RF-51, 1947–1949
  • RF-80, 1951–1956
  • RF-86, 1951–1956
  • F-80, 1952–1953
  • F-86, 1953;
  • RF-84, 1956–1958
  • RF-101, 1958–1966
  • RF-4, 1967-1990.
  • None, 1991-1994.
  • MQ-1 Predator to present

Emblem

A carrier pigeon in natural colors with wings extended perched on a telescope white outlined in black upon a shield of blue and yellow parted diagonally from "northwest" to "southeast", the blue above, the yellow below. Approved 2 April 1924

Campaign Streamers

  • World War II: Europe-Africa-middle Eastern (EAME) Theater: Air Offensive, Europe; Normandy; Northern France; Rhineland Ardenees-Alsace; Central Europe; Air Combat.
  • Korean War: First UN Counteroffensive; CCF Spring Offensive; UN Summer-Fall Offensive; Second Korean Winter; Korea Summer-Fall, 1952; Third Korean Winter; Korea Summer-Fall, 1953.

Decorations

  • Distinguished Unit Citations: Korea, 25 February - 21 April 1951; Korea, 9 July - 27 November 1951; Korea, 1 May - 27 July 1953.
  • Cite in Order of the Day, Belgian Army: 6 June- [25 June] 1944.
  • Republic of Korea Presidential Unit Citation: [25] February 1951 - 31 March 1953.
  • Republic of Vietnam Gallantry Cross with Palm: 1 April - 30 November 1966.
  • Air Force Outstanding Unit Awards: 1 December 1952 - 3 April 1953; 10 May -27 August 1962; 1 September 1962 - 31 August 1963; 1 August 1964 - 5 June 1965; 6 June 1965 - 31 December 1966; 1 January 1968 - 31 December 1969; 1 January 1974 - 31 December 1975; 1 June 1977 - 31 May 1979; 1 October 1979 - 31 May 1980; 1 July 1981 - 31 May 1983; 1 June 1983 - 31 May 1984; 1 June 1984 - 31 May 1986; 1 June 1987 - 31 May 1989; 1 October 1989 - 30 October 1990; 13 April 1992 - 30 June 1993.
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