HOWITZER EXERCISE Marines fire an M777 A2 howitzer during a series of integrated exercises at the Combat Center’s Quakenbush Training Area in Twentynine Palms, Calif., April 26, 2013. The Marines are assigned to 5th Battalion, 14th Marine Regiment. SHARE: Download: Full Size (0.07 MB) Credit: VIRIN: 012017-D-QYG40-241.jpg Photo Gallery