Staff Sgt. DeMario Greene, 54th Helicopter Squadron special missions aviator, simulates running through a preflight checklist at Minot Air Force Base, , Sept. 14, 2016. Greene, a systems expert on the UH-1N Iroquois, is responsible for working with the pilots to help ensure a safe flight and troubleshoot mechanical, electrical and fuel problems in the event of an emergency. ( Air Force photo/Airman 1st Class Armstrong)

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Photo credit: © PJF Military Collection / Alamy / Afripics
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Keywords: 54th, afgsc, air, avaitor, command, defend, deter, force, global, helicopter, helo, hs, missions, special, squadron, strike