Crew of a 40mm anti-aircraft gun on the USS Alaska mounting clips into the loaders off Iwo Jima on March 6, 1945.

Source : Official U.S. Navy Photograph, now in the collections of the National Archives #80-G-K-3740.

USS Alaska (CB-1): Crew of a 40mm quad antiaircraft machine gun mount loading clips into the loaders of the left pair of guns. Taken on 6 March 1945, during the Iwo Jima operation. The man at the right is Seaman Second Class Richard Roberts, and the gun captain (in the phone talker's helmet) is Gunner's Mate Second Class Glenn F. Groff.