Airman earns Ranger Tab Staff Sgt. Robert Keefe, 736th Security Forces Squadron NCO in charge of training, graduated from the U.S. Army’s Ranger School Oct. 16, 2015. Keefe was the 266th Airman to persevere through the rigorous 61-day course. (U.S. Air Force photo/Senior Airman Joshua Smoot) SHARE: Download: Full Size (1.33 MB) Tags: army ranger school, ranger, 736th security forces, 736 sfs, air force ranger, air force, security forces Credit: Senior Airman Joshua Smoot VIRIN: 160113-F-UA699-026.JPG Photo Gallery