Col. Michael Richards, 59th Hyperbaric Medicine Flight commander, observes as Staff Sgt. Sherri Jones, hyperbaric medical technician, demonstrates the controls of the monoplace hyperbaric chamber at the Wilford Hall Ambulatory Surgical Center, Joint Base San Antonio-Lackland, Nov. 18, 2015. Treatments in the chamber help wounded warriors, diabetics and cancer patients recover more quickly from their ailments. (U.S. Air Force photo / Tech. Sgt. Christopher Carwile)