Aircrew members from the 61st Airlift Squadron walk toward a simulated decontamination area during phase IIb of ROCKI 20-01 at Little Rock Air Force Base, Arkansas, Nov. 16, 2019. Phase II is divided into two sub-phases: phase IIa stresses Airmen’s ability to survive and operate in a simulated chemical environment; phase IIb stresses their ability to survive and operate in a simulated radiological environment. (U.S. Air Force photo by 1st Lt. Jessica Cicchetto)