Green Scene Air Force defenders participate in a three-day field training exercise focused on survival techniques in the Turtle Mountain State Forest, N.D., Feb. 14, 2018. The airmen are assigned to the 91st Security Forces Group. Air Force photo by Senior Airman J.T. Armstrong SHARE: Download: Full Size (1.78 MB) Credit: Senior Airman Justin Armstrong VIRIN: 180214-F-CG053-1545C.JPG Photo Gallery