General Officer Commanding (GOC) is the usual title given in the armies of Commonwealth

Commonwealth of Nations

The Commonwealth of Nations, normally referred to as the Commonwealth and formerly known as the British Commonwealth, is an intergovernmental organisation of fifty-four independent member states...

 (and some other) nations to a general officer who holds a command appointment. Thus, a general might be the GOC II Corps or GOC 7th Armoured Division

British 7th Armoured Division

The 7th Armoured Division was a British armoured division which saw service during the Second World War where its exploits made it famous as the Desert Rats....

. A general officer heading a particularly large or important command may be called a General Officer Commanding-in-Chief (GOC-in-C).

The equivalent term for air force officers is Air Officer Commanding

Air Officer Commanding

Air Officer Commanding is a title given in the air forces of Commonwealth nations to an air officer who holds a command appointment. Thus, an air vice marshal might be the AOC 38 Group...

(AOC).