"Act of Valor began as a recruitment video for the U.S. military's Naval Special Warfare Command. In 2007, Mike McCoy and Scott Waugh of Bandito Brothers Production filmed a video for the Special Warfare Combatant-craft Crewmen SWCC which led the Navy to allow them to use SEALs for Act of Valor. None of the SEALs' names will appear in the credits of the film."
http://en.wikipedia.org/wiki/Act_of_Valor