Carbine Technique A U.S. soldier, left, teaches a French Foreign Legion soldier how to properly operate an M4 carbine rifle at a firing range in Djibouti, March 5, 2016. Air Force photo by Tech. Sgt. Barry Loo SHARE: Download: Full Size (1.69 MB) Tags: djibouti, soldiers, army Credit: Tech. Sgt. Barry Loo VIRIN: 160305-F-IJ878-519A.JPG Photo Gallery