U.S. Air Force Senior Airman Ruben Mejia, 1st Maintenance Squadron precision measurement equipment laboratory technician, performs a pressure and flow check on a Joint Combined Aircrew Systems Tester at Joint Base Langley-Eustis, Va., March 17, 2017. The PMEL flight has 23 members, who maintain approximately 5,100 pieces of equipment, ranging from torque wrenches, to equipment used to calibrate F-22 landing gear. (U.S. Air Force photo/Senior Airman Areca T. Bell)