I retired from the Air Guard in 2007 but spent about 7 years active AF as Security Forces 2 years of that was missile field at Malmstrom Montana. Here is what Sig will say. The doctrine for the AF is to carry the M18 with a round chambered and the weapon on fire. The reason is way back whem we carried Model 15 revolvers all chambers loaded and spares in a dump pouch or speedloaders
Whem we went to the M9 we loaded a round in the chamber hammer down on fire first round was like our revolvers. They kept that with the M18 which is safe it’s no different than an Sig with no thumb safety.
Also if not the AF we went to JHP in 9mm for stateside use around 1999 back them it was Federal 135 hi Shok JHP however at some point it was switched to a 147 either HST or G2 Gold Dot I am not 100% sure.
I did speak with a friend from the Air Guard and they are now directed to carry empty chambers u til they can figure out a fix.