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Lt. Col. (Dr.) Arnold T. Stocker of South Florida Tactical Athletes, a preparatory school for those looking to join special operations, advises proper form, August 8, 2018, at a pool in Plantation, Florida. Stocker, who leads the program, is a clinical nurse with the 920th Aeromedical Staging Squadron who held two special operations careers as an Army Special Forces medical sergeant and Air Force Pararescueman. (U.S. Air Force photo Tech. Sgt. Jared Trimarchi)
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