Members of the 19th Aircraft Maintenance Squadron replace a propeller on a C-130J Super Hercules during phase II of ROCKI 20-01 at Little Rock Air Force Base, Arkansas, Nov. 13, 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 Airman 1st Class Mariam Springs)