Army Staff Sgt. Derek Leonhardt, assigned to B Troop, 1st Squadron (Airborne), 40th Cavalry Regiment, 4th Brigade Combat Team (Airborne), 25th Infantry Division, Army Alaska, conducts chemical, biological, radiological and nuclear defense training on Joint Base Elmendorf-Richardson, Alaska, Wednesday, April 13, 2016. The training culminated with masked Soldiers entering a sealed chamber filled with CS, then removing their protective gear to promote confidence in their equipment. CS, technically known as 0 chlorobenzalmalononitrile, is a solid white powder mixed with a dispersal agent and

---

Army Staff Sgt. Derek Leonhardt, assigned to B Troop, 1st Squadron (Airborne), 40th Cavalry Regiment, 4th Brigade Combat Team (Airborne), 25th Infantry Division, Army Alaska, conducts chemical, biological, radiological and nuclear defense training on Joint Base Elmendorf-Richardson, Alaska, Wednesday, April 13, 2016. The training culminated with masked Soldiers entering a sealed chamber filled with CS, then removing their protective gear to promote confidence in their equipment. CS, technically known as 0 chlorobenzalmalononitrile, is a solid white powder mixed with a dispersal agent and commonly referred to as tear gas. ( Air Force photo/Justin Connaher)

---

Size: 3522px × 2440px
Photo credit: © AB Forces News Collection / Alamy / Afripics
License: Licensed
Model Released: No

Keywords: airborne, alaska, army, base, biological, chemical, cs, elmendorf-richardson, gas, jber, joint, nuclear, pacific, paratroopers, radiological, training, usarpac