National Geographic : 1941 Jul
Around the Clock with Your Soldier Boy I, S. Army Signal Corps, Oficial Earth-bound Men Speak to Sky Riders by Portable Field Radio Miracle of modern communications is the Army's radio, by which tanks, trucks, gun crews, planes, bal loons, all may report to headquarters. One man turns a generator crank to make "juice." Smaller outfits carried by one soldier are known in Army slang as "walkee-talkees." Maneuvers near Biloxi, Mississippi. Staff Photographer J. Baylor Roberts Not Even a Stygian Stream Can Stop the Army Engineers At Fort Belvoir, Virginia, Engineer troops practice with assault boats. Used for combat, and to establish bridgehead positions in hostile territory, the tubby craft are nested like plates and moved up by truck. Each squad carries its boat to the water's edge.