U.S. Army soldiers spread concrete as they construct a new helicopter landing pad at the National Training Center in the Mojave Desert, Fort Irwin, Calif., July 21, 2009. U.S. Army soldiers spread concrete as they construct a new helicopter landing pad at the National Training Center in the Mojave Desert, Fort Irwin, Calif., July 21, 2009. SHARE: Download: Full Size (4.41 MB) Tags: Photo Essays Credit: VIRIN: 734086-M-QBJ54-927.jpg Photo Gallery