A U.S. Marine Corps M777A2 lightweight 155 mm howitzer fires a projectile in support of an air assault course on Bradshaw Field Training Area, Northern Territory, Australia, June 29, 2015. A U.S. Marine Corps M777A2 lightweight 155 mm howitzer fires a projectile in support of an air assault course on Bradshaw Field Training Area, Northern Territory, Australia, June 29, 2015. SHARE: Download: Full Size (0.241724 MB) Tags: photo essays Credit: VIRIN: 135847-F-TVQ07-290.jpg Photo Gallery