Braving the cold: 91st SFG participates in survival exercise
A 91st Missile Security Forces Squadron defender holds a M18 smoke grenade over a signal fire in the Turtle Mountain State Forest, N.D., Feb. 14, 2018. The signal fire’s heat lifts the M18’s green smoke for better signaling. (U.S. Air Force photo by Senior Airman J.T. Armstrong)

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Photo by: Senior Airman J.T. Armstrong |  VIRIN: 180214-F-CG053-0194.JPG