I have the book in front of me. I see no such footnote. Can you provide proof of this?
I work at the Rock Island Arsenal Museum ( a U.S. Army military Museum ) and I have come in contact with more than a few "Special Operators " in the past few years. The Rock Island Arsenal is an active duty military base, with detachments from all five members of the military on base. ( yes, there are five. The newly created Space Force is here. ) What Navy Seals and Army special forces personnel are doing on base is a mystery to me, but there they are here. There are about 800 active duty military personnel on base and there are seven General grade officers stationed here. (That's a lot of stars for such a small base..)
Yesterday, A LTC with an arrow head and three lightning bolts patch ( Special Forces, Green Beret ) on his right shoulder came in. I asked him if he ever carried his weapon with a mag inserted and the chamber empty with the hammer down.
The answer was no. the weapon is carried completely empty with no magazine inserted... until you are on the chopper on the way to an engagement. Then it is locked and loaded with the safety engaged upon touchdown.
So, yes, the movie was inaccurate, ( Like that's never happened before!! ) but that was what Eric Bana said in the movie.
P.S. NEVER JUDGE A BOOK BY IT'S MOVIE!