Cold Commute An Air Force UH-1N Iroquois helicopter lifts a simulated casualty above the Turtle Mountain State Forest in North Dakota, Feb. 14, 2018, during a 91st Security Forces Group field training exercise. Air Force photo by Senior Airman J.T. Armstrong SHARE: Download: Full Size (2.38 MB) Credit: Senior Airman Justin Armstrong VIRIN: 180214-F-CG053-1265C.JPG Photo Gallery