Staff Sgt. Jonathon Lee, pulmonary technician with the Aeromedical Consultation Service Internal Medicine Branch, conducts a demonstration of a pulmonary function test for forced vital capacity as Staff Sgt. Sean O’Neill sits in a pressurized cabin awaiting the command to exhale. The branch reviews around 700 requests for waiver recommendation cases annually concerning pilots, navigators and other aircrew, with 90 percent of them receiving waiver recommendations. (U.S. Air Force photo/John Harrington)
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