11-050 Garand Picture ot the Day Korea

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In a battle during the Korean War, a U.S. Marine carrying a bayonet rifle leaps across an embankment as a comrade waits to follow during the drive toward the Naktong River on South Korea's general front on Aug. 22, 1950. Marines rushed from the southern sector to help stem the enemy drive on Taegu. (AP Photo/Max Desfor)

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Unidentified American soldiers man a 75mm recoilless rifle covering a vital road somewhere in South Korea on July 31, 1950, during the Korean War. (AP Photo)

Looks like 2 carbines and an M3 in the trench. Is that a row of mags laid out to the right of the 75's barrel? If so can anyone tell what they probably fir?
Thaine

Maybe that M3 to the right?