Capt. (Dr.) Brenna Shackelford, 99th Medical Operations Squadron staff emergency room physician, briefs medical residency students about a medical training mannequin, July 24, 2013, at Nellis Air Force Base, Nev. The residents learned and conducted a chest tube thoracostomy. A thoracostomy is done to drain fluid, blood, or air from the space around the lungs. (U.S. Air Force Photo by Airman 1st Class Jason Couillard)
Airman 1st Class Jason Couillard
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