"He felt, and so did the other members of his team, that the very existence of our republic is at stake," his father, Billy Vaughn, told NBC's "Today." "Because of that, Aaron was willing to give his life."
Obama pays respects to copter-crash victims →
One of the fathers, Billy Vaughn, has written a book, "Betrayed: The Shocking True Story of Extortion 17 as Told by a Navy SEAL's Father."
Navy SEALs cite shabby treatment as Obama administration helps Hollywood instead →