Hand Signals A Marine employs hand signals during high-mobility artillery rocket system training as part of Exercise Emerald Warrior 18 at Cannon Air Force Base, N.M., March 5, 2018. Air Force photo by Tech. Sgt. Larry E. Reid Jr. SHARE: Download: Full Size (1.51 MB) Tags: marines, northcom, northern command, emerald warrior 18, training, marine corps Credit: Tech. Sgt. Larry Reid Jr. VIRIN: 180305-F-KA253-0496A.JPG Photo Gallery