Description: A 60mm mortar squad on Iwo Jima during an engagement. The gunner, on the left, adjusts the traverse wheel to "level the bubble." The "A" gunner hangs an M49A2 high explosive round in the muzzle and stands by for the order to fire.

Source: http://ww2gyrene.org.hosting.domaindirect.com/weapons_m2mortar.htm archive copy at the Wayback Machine , labeled as USMC photo.

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