One of America's elite special operations units was back in the spotlight when a SEAL claiming to be the "trigger man" who killed Osama bin Laden in May of 2011 decided to reveal his identity on a Fox News special last month.
A recent PBS documentary, "Navy SEALs - Their Untold Story," digs into the history of their predecessors during World War II, their first official operations in the Vietnam War, and their deployment in 21st century conflicts.
Along the way, former commandos tell the stories of some of the SEALs' most incredible covert operations.
There are only around 2,000 active Navy SEALs — and they endure maybe the hardest military training anywhere in the world.
A retired SEAL explains that during the rigorous training known as "hell week,""you stay up for 120 hours ... and you get about 3 or 4 hours sleep."
Here trainees swim with their hands bound behind their backs, a feat only excellent swimmers can pull off.
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