Staff Sgt. Marco Nelson (right), a Ranger Assessment Course instructor, tells a student what he did wrong during the water survival portion of the course at the Municipal Pool, Las Vegas, Oct. 2, 2014. Many students who do not make it through the course underestimate its intensity or fail to do proper research on the course. Every RAC instructor is a U.S. Army Ranger School graduate. (U.S. Air Force photo by Airman 1st Class Thomas Spangler)
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