Mortar Exercise U.S. soldiers fire an M224 mortar system during a live-fire exercise near Camp Lemonnier, Djibouti, Dec. 16, 2015. U.S. Air Force photo by Senior Airman Cory D. Payne SHARE IMAGE: Download Image: Full Size (0.58 MB) Photo By: Senior Airman Cory D. Payne VIRIN: 151216-F-LP538-667.JPG Photo Gallery