The M-1965 Field Jacket, also known as the M65 and the "M-65 Field Jacket", is a popular field jacket

Jacket

A jacket is a hip- or waist-length garment for the upper body. A jacket typically has sleeves, and fastens in the front. A jacket is generally lighter, tighter-fitting, and less insulating than a coat, which is outerwear...

 designed for the US military. It was introduced into US military service in 1965 to replace the M-1951 field jacket

M-1951 field jacket

The M-1951 field jacket was a US Army four pocket jacket made of 9-ounce wind resistant water repellent treated cotton sateen cloth in Olive Green Shade 107 . In November 1956 it was redesignated as the M-1951 field coat....

 still preferred by US Troops, an improvement on the M-1943 field jacket of Second World War design. The M-1965 had a built in hood that rolled up and fit into a pouch on the back of the neck as opposed to the separate hood that attached to the M-1951.