MG Gunner on a He 111 Cockpit

German Machine-Gunner in the Cockpit of a two-engine Heinkel He-111 medium bomber, 1940. These He 111 crews of Kampfgeschwader 26 (KG) 26 had long flights over the North Sea from their bases in Norway to contend with, as well as the prospect of meeting RAF fighters off the northeast coast of Britain as they approached their targets.

Source :
"RAF Fighters vs Luftwaffe Bombers; Battle of Britain" by Andy Saunders