U.S. Air Force Staff Sgt. Christine Castro, the ambulance service noncommissioned officer in charge at the 633rd Medical Operations Squadron, opens a syringe prior to beginning an IV on Senior Airman Bryan Almonacid, an aerospace medical service technician from the 633rd MDOS, in the USAF Hospital Langley Emergency Room at Langley Air Force Base, Va., Feb. 26, 2016. The Langley ER staff includes nurses, doctors, medical technicians, civilian employees, contractors and paramedics who work around the clock to treat Department of Defense beneficiaries. (U.S. Air Force photo by Staff Sgt. Aubrey White)