bullet sponge
n.— «Others in the Army call them grunts, or trigger pullers, or crunchies, for the sound of a tank rolling over a dead soldier. Sgt. Allan Toney has heard them all. “Bullet taker, bullet sponge, bullet stopper,” he recites while smoking a cigarette outside the concrete barriers protecting his battalion’s tent city. “Joe.”» —“Infantrymen thrive in the thick of things” by Wes Allison in Camp Pennsylvania, Kuwait St. Petersburg Times (Florida) Mar. 23, 2003. (source: Double-Tongued Dictionary)