Brazilian Air Force Sub Officer Alexandre Pereira de Silva, conducts preflight inspections on a Casa 295 aircraft prior to a flight departure during Exercise Mobility Guardian at Joint Base Lewis-McChord, Wash., Aug. 7, 2017. Mobility Guardian provides U.S. and international partners a realistic training environment, which includes joint missions between Air Force airdrop crews and Army Airborne units, contingency response and humanitarian relief operations scenarios. (U.S. Air Force photo by Staff Sgt. Angela Ruiz)