U.S. Air Force Airman Austin Romanov, a 354th Civil Engineer Squadron electrical systems apprentice, puts on his mission-oriented protective posture gear for chemical warfare training during exercise Arctic Gold 17-5 (AG) April 6, 2017, at Spruce Lake on Eielson Air Force Base, Alaska. Airmen from all around the base participated in the chemical warfare training in support of AG 17-5. (U.S. Air Force photo by Airman 1st Class Isaac Johnson)

U.S. Air Force Airmen from the 354th Fighter Wing, perform a buddy check on a fellow Airman’s gas mask during chemical warfare training for exercise Arctic Gold 17-5 April 6, 2017, at Spruce Lake on Eielson Air Force Base, Alaska. The Airmen were putting on their gas masks in response to a simulated possible chemical threat. (U.S. Air Force photo by Airman 1st Class Isaac Johnson)

U.S. Air Force Senior Airman Stefanie Nakoneczny-Wood, a 354th Civil Engineer Squadron emergency management journeyman, inspects an Airman’s mission-oriented protective posture gear during exercise Arctic Gold 17-5 April 6, 2017, at Spruce Lake on Eielson Air Force Base, Alaska. During this portion of the training, Airmen had to get into full gear anytime they heard the siren go off. (U.S. Air Force photo by Airman 1st Class Isaac Johnson)

U.S. Air Force Airmen from the 354th Fighter Wing, put down M8 paper during chemical warfare training for exercise Arctic Gold 17-5 April 6, 2017, at Spruce Lake on Eielson Air Force Base, Alaska. M8 paper is a paper used to detect certain types of chemical threats that can be dispersed into the air after a chemical attack. (U.S. Air Force photo by Airman 1st Class Isaac Johnson)

U.S. Air Force Airman 1st Class Cayden Riddle, a 354th Civil Engineer Squadron pavement and construction equipment operator, listens to his walkie-talkie during chemical warfare training for exercise Arctic Gold 17-5 April 6, 2017, at Spruce Lake on Eielson Air Force Base, Alaska. During this portion of the training, only a select few Airmen were allowed to go outside their simulated bunkers to do precision approach radar sweeps. (U.S. Air Force photo by Airman 1st Class Isaac Johnson)

U.S. Air Force Airman Terrance Allen, a 354th Force Support Squadron food service apprentice, serves Airmen during chemical warfare training for exercise Arctic Gold 17-5 April 6, 2017, at Spruce Lake on Eielson Air Force Base, Alaska. During the training, food services members participated in most of the events while also serving hot breakfast and lunch. (U.S. Air Force photo by Airman 1st Class Isaac Johnson)

U.S. Air Force Airmen from the 354th Fighter Wing, transport a simulated casualty to safety during chemical warfare training for exercise Arctic Gold 17-5 April 6, 2017, at Spruce Lake on Eielson Air Force Base, Alaska. During the training Airman diagnosed, provided self-aid buddy care and transported simulated casualties while in full mission-oriented protective posture gear. (U.S. Air Force photo by Airman 1st Class Isaac Johnson)