Pvt. Michael Negast of Patterson, N.J., crawls through a narrow communication trench between positions in the main line of Defence at Saidor, New Guinea. One of the first lesson a man must learn in jungle warfare is never to go anywhere regardless of how short a distance without his rifle. The emplacement in the background is constructed of heavy logs and sandbags to ward off the lighter type of enemy projectiles. February 7, 1944. (Photo by U.S. Signal Corps Photo).