UPHILL BATTLE U.S. Marines move into firing positions during a Clear Hold Build Exercise with Marine Medium Tiltrotor Squadron 261, at Quackenbush Training Area on Marine Corps Air Ground Combat Center, Twentynine Palms, Calif., July 19, 2009. The Marines are assigned to with Kilo Company, 3rd Battalion, 6th Marine Regiment. SHARE: Download: Full Size (0.06 MB) Credit: VIRIN: 094883-F-DXW66-279.jpg Photo Gallery