HOWITZER DRILL U.S. Army Pvt. 2nd Class Jeff Frizzell and Sgt. Robert Sullivan conduct a proficiency drill demonstration with fellow members of the A-3/321 Field Artillery Regiment on Forward Operating Base Salerno, Afghanistan, April 13, 2011. The soldiers performed the drill with a M777A2 howitzer while being observed by U.S. Army Command Sgt. Maj. Marvin Hill, senior enlisted leader, International Security Assistance Force-U.S. Forces Afghanistan. SHARE: Download: Full Size (0.09 MB) Credit: VIRIN: 297946-A-ZKW83-375.jpg Photo Gallery