An Airman performs a chamber reaction during a simulated chamber flight Sept. 3, 2019, inside the Hyperbaric Chamber Room on Columbus Air Force Base, Miss. To give a more accurate representation of the exercise, volunteers were asked to participate as students inside the chamber, providing a level of unpredictability for the AOP Airmen to critically think rather than predicting what to do. (U.S. Air Force photo by Airman 1st Class Hannah Bean)