When Major Foster and Mike Faber are talking, there are no branch insignia on his uniform.
In his flashback, the Iraqis put an automatic pistol to Sgt Brody's head and force him to kneel beside the hole he has just dug. He continues to sing the Marine Corps Hymn, but gets the lyrics wrong. He sings, "First to fight for right and country" and "Proud to bear the title". The correct lyrics are, "First to fight for right and freedom" and "We are proud to claim the title".