Robert O'Neill, a former U.S. Navy SEAL, speaks at the Clayton Center for the Arts in Maryville, Tennessee, on Nov. 6, 2014
Luke Sharrett—Bloomberg/Getty Images
Robert O'Neill, a former U.S. Navy SEAL, speaks at the "Best of Blount" Chamber of Commerce awards ceremony at the Clayton Center for the Arts in Maryville, Tenn., Nov. 6, 2014.
Akhtar Soomro / Reuters
A young boy plays with a tennis ball in front of the compound where U.S. Navy SEAL commandos reportedly killed al Qaeda leader Osama bin Laden in Abbottabad, on May 5, 2011.
Benjamin Lowy / Reportage by Getty Images for TIME
New members of the Mission Continues, a veteran organization dedicated to community service, founded by former Navy SEAL Eric Greitens, donate their time renovating the League School in Brooklyn, NY and take their membership pledge at Ground Zero on May 4, 2013 in New York City.
Geronimo Nevada LLC
Actors Freddy Rodriguez and Cam Gigande in Seal Team Six.
St. Martin's Press
The Navy Seal, aboard an H-3 helicopter in 1990, readies for an assault on an enemy ship
Charles Ommanney / Getty Images
A group of Navy Seal trainees kneel on a beach in August 2010 during Hell Week in Coronado, California.
Paul Moseley / Fort Worth Star-Telegram / MCT / Getty Images
The late Chris Kyle, former Navy SEAL sniper.
Courtesy Greg Marra
Sculptor Greg Marra and his statue of Navy SEAL Chris Kyle.
Erath County Sheriff’s Office / AP
Eddie Ray Routh, charged in the murder of Navy SEAL sniper Chris Kyle and another vet.