When the Recon unit is standing next to the CH-47 Chinook helicopter, the helicopter is on a concrete pad surrounded by grass, and the rear tires are flat, indicating that this is a static display, not an active aircraft.
When Sgt Major Sauer (R. Lee Ermey) is training Harm, Harm addresses him as 'Sir'. This is inappropriate. He should address Sauer as Sargent Major or Gunney. Most senior NCO's would not tolerate being addressed as 'Sir', at term reserved for officers.
Captain Koonan is wearing two badges on his uniform, a gold Marine Corps parachutist badge, issued for more than five jumps. And a silver SCUB diver badge, which indicates he has only completed basic Marine Corps SCUB training. Force Recon is the Marine's most elite special operations unit, one of the requirements for being Force Recon is completion of the Combat Diving Course, which is issued a gold badge.