History: Crew of a 40mm anti-aircraft machine gun on the USS Alaska mounting clips into the loaders of the left pair of guns, off Iwo Jima, March 6, 1945. [738 x 922]

http://i.imgur.com/YWYmiMW.jpg via /r/HistoryPorn http://www.reddit.com/r/HistoryPorn/comments/3zrumr/crew_of_a_40mm_antiaircraft_machine_gun_on_the/