A slightly expanded photo of the one already posted - 
A machine gun crew of the 5th Marine Division with a Browning M1917 machine gun, firing at the enemy on the island of Iwo Jima. Empty ammunition boxes and spent shell casings all around them.; March 5, 1945.
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Machine gun crew in action

A U.S. Marine posing with a captured Japanese Type 99 light machine gun with a long bayonet, Saipan, Mariana Islands, Pacific Ocean; 15 July, 1944.
   Must be awkward to be in close combat with that combination...

Bayonet on a machine gun...?

At the March 21, 1945 dedication of the 5th Marine Division cemetery on Iwo Jima, the cemetery flag is raised. The 5th Division had lost 1,500 men killed or wounded by the end of just the second day of fighting on the island. 