HOWLING HOWITZER A U.S. Marine fires a M777 howitzer during a battle drill on Arta Range, Djibouti, Nov. 3, 2013.The Marines are assigned to the 13th Marine Expeditionary Unit Battalion Landing Team. A five-person gun crew can fire as many as five rounds per minute. SHARE: Download: Full Size (0.06 MB) Credit: VIRIN: 255199-Y-VHU07-662.jpg Photo Gallery