Dorsal gunner
A dorsal gunner, mid-upper gunner or top gunner is an air gunner responsible for operating a gun position or turret located on the upper fuselage, between the cockpit and tail of some military aircraft.
Between World War I and the 1950s, most heavy bombers, large attack/strike aircraft and long-range maritime patrol aircraft featured a dorsal, mid-upper or top gun position.
B Mk X and some Consolidated B-24 Liberators.
During World War II, the mid-upper gunners of British Commonwealth heavy bomber crews were regarded as the primary observer of a crew, and were responsible for detecting the approach of enemy fighter aircraft, as well preventing collisions with friendly aircraft and accidental mid-air bomb strikes.
