US Marines scrambling down cargo net ladders into an LCP landing craft during the amphibious invasion of Saipan; June 1944. 

Amphibious invasion

American soldier posing in a  M45 quadmount in the South West Pacific area, probably March, 1944.The quadmount isn't loaded.One can see 2 ammoboxes sitting on the right side.The quad is most likely mounted on a LVT4 (landing vehicle tracked).Is must have been hell on a gunner's ears if they fired this weapon without protection.
taken from fb

Quadmount

Marines from the 5th Division celebrate Japan's surrender by boarding a jeep with musical instruments, a US flag and a homemade banner that says "Peace". Iwo Jima Island. ; September 1945.