U.S. Air Force Airmen inspect each other after putting on mission-oriented protective posture gear at Joint Base Langley- Eustis, Virginia, Feb. 26, 2018. The exercise provided 1st Fighter Wing Airmen training in order to survive in the event of a chemical attack. (U.S. Air Force photo by Airman 1st Class Alexandra Singer)

U.S. Air Force Airmen receive feedback from an exercise inspector at Joint Base Langley-Eustis, Virginia, Feb. 26, 2018. The mission-oriented protective posture gear includes a gas mask to protect Airmen from a toxic environment. (U.S. Air Force photo by Airman 1st Class Alexandra Singer)

U.S. Air Force Chief Master Sgt. Derek Crowder, 1st Fighter Wing command in chief (left) and Col. Jason Hinds, 1 FW commander (right) listen to exercise feedback at Joint Base Langley-Eustis, Virginia, Feb. 26, 2018. The Chemical Attack Survival Familiarization exercise provided the 1st Fighter Wing Airmen training on how to put on appropriate gear during a chemical attack. (U.S. Air Force photo by Airman 1st Class Alexandra Singer)

U.S. Air Force Airmen sit down for a brief break during a Chemical Attack Survival Familiarization exercise at Joint Base Langley-Eustis, Virginia, Feb. 26, 2018. The exercise tested Airmen on how well they are able to put on their gear, as well as ensuring they have full accountability of all personnel. (U.S. Air Force photo by Airman 1st Class Alexandra Singer)

U.S. Air Force Airmen wait for an all-clear alert during a Chemical Attack Survival Familiarization exercise at Joint Base Langley- Eustis, Virginia, Feb. 26, 2017. Airmen demonstrated their ability to change into different levels of Mission Oriented Protective Posture gear in the event that they are exposed to a toxic environement. (U.S. Air Force photo by Airman 1st Class Alexandra Singer)

U.S. Air Force Airmen lay on the ground after putting on Mission Oriented Protective Posture gear at Joint Base Langley- Eustis, Virginia, Feb. 26, 2018. This gear is used in toxic environments during a chemical, biological, radiological, or nuclear attack. (U.S. Air Force photo by Airman 1st Class Alexandra Singer)

A U.S. Air Force Airman removes her gloves after participating in the Chemical Attack Survival Familiarization exercise on Joint Base Langley-Eustis, Virginia, Feb. 26, 2018. Due to enemies having access to chemical weapons, the 1st Fighter Wing conducted an exercise to train on surviving such an attack. (U.S. Air Force photo by Airman 1st Class Alexandra Singer)

U.S. Air Force Airmen wait for further guidance during a Chemical Attack Survival Familiarization exercise at Joint Base Langley- Eustis, Virginia, Feb. 26, 2018. The 1st Fighter Wing conducted the exercise to test Airmen’s capability for putting on Mission Oriented Protective Posture gear. (U.S. Air Force photo by Airman 1st Class Alexandra Singer)