DYESS AIR FORCE BASE, Texas - Lance Corporal Roberto Muela, Detachment 1, awaits a question while inhaling tear gas in the gas chamber, April 12. The Marines are required to answer a question given by the instructors before exiting the chamber to ensure that they get the full affect of the gas. (U.S. Air Force photo by Senior Airman Courtney Richardson)

DYESS AIR FORCE BASE, Texas- Marines, Detachment 1, remove their gas mask, April 12. Service Members try on their mask before confidence training to make sure they fit and it has a proper seal. (U.S. Air Force photo by Senior Airman Courtney Richardson)

DYESS AIR FORCE BASE, Texas - Lance Corporal James White, Detachment 1, waits for further instructions in the gas chamber, April 12. Once inside the chamber, service members are exposed to tear gas. (U.S. Air Force photo by Senior Airman Courtney Richardson)

DYESS AIR FORCE BASE, Texas - Senior Airman Scott Arrington, emergency management, introduces himself to the Marine detachment before the beginning of chemical warfare training, April 12. Chemical warfare training consists of the proper wear of a chemical suit,gas mask, and gas mask confidence training. (U.S. Air Force photo by Senior Airman Courtney Richardson)

DYESS AIR FORCE BASE, Texas- Marines from Detachment 1, inspect their gas mask before entering the gas chamber, April 12. The gas masks are inspected to maintain seviceability. (U.S. Air Force photo by Senior Airman Courtney Richardson)

DYESS AIR FORCE BASE, Texas- Lance Corporal's Elizabeth Kersey and Ashley Rodriguez, Detachment 1, take down their hair, April 12. Women who go through the gas mask confidence training are required to take down their hair, so they are not fidgting with it when donning their gas mask. (U.S. Air Force photo by Senior Airman Courtney Richardson)

DYESS AIR FORCE BASE, Texas- Airman First Class Mathew Moklar, emergency management, demonstrates the order of tightening the gas mask to a group of marines, April 12. The order of tightening the straps is important to ensure a proper seal from chemical agents. (U.S. Air Force photo by Senior Airman Courtney Richardson)

DYESS AIR FORCE BASE, Texas- Corporal Christopher Wright, Detachment 1, exits the gas chamber, while Senior Airman Scott Arrington, emergency management, demostrates the proper recovery techniques, April 12. The best and quickest way to recover from the gas chamber is to walk into the wind and do not touch your face. (U.S. Air Force photo by Senior Airman Courtney Richardson)

DYESS AIR FORCE BASE, Texas- Lance Corporal Gergorio Herrandez, Detachment 1, lunges out of the gas chamber, April 12. The physical effects of tear gas are burning sensation, difficulty breathing, and sinus discharge. (U.S. Air Force photo by SrA Courtney Richardson)

DYESS AIR FORCE BASE, Texas- Staff Sergeant Clayton Greer, Detachment one, walks out of the gas chamber with the assistance of Airman First Class Mathew Moklar, emergency management, April 12. Before a service member can exit the chamber they are required to answer a question to ensure they receive the full affects of the tear gas. (U.S. Air Force photo by Senior Airman Courtney Richardson)

DYESS AIR FORCE BASE, Texas- Marines from Detachment one, size up their gas mask, April 12. Service members fit their gas mask to their face tightly to ensure a proper seal. (U.S. Air Force photo by Senior Airman Courtney Richardson)

DYESS AIR FORCE BASE, Texas- Marines from Detachment one, wait for more instructions on the use and wear of the gas mask, April 12. Marines have annual chemical warfare training to maintain an active deployment status. (U.S. Air Force photo by Senior Airman Courtney Richardson)