A modified shipping container called a Collective Protection Conex sits in the 28th Test and Evaluation Squadron's Agile Combat Support division's large-scale, controlled environment facility at Eglin Air Force Base, Fla., Oct. 20. The division evaluated the heavily modified and instrumented conex’s airlock functionality, clean-air requirements, purge rates, leakage tests and overall ability to withstand in a biologically and chemically contaminated environment. (U.S. Air Force photo/Samuel King Jr.)