What military shows, movies, and plays often lack is authenticity. When David Broyles, a military special operations veteran, and Academy Award nominee William Broyles, created History Channel’s new Navy SEAL show “SIX,” based on SEAL Team Six, they wanted to get it right.

So they sent the cast to SEAL FIT, a 10-day course modeled after the grueling Navy SEAL training program known as BUD/S.