A very interesting posting. I have never seen any U.S. box like this before, although I have a .45 Auto box from a Philippine Army Reloading plant, that had RPA headstamps and lead RN bullets.
Whatever the reason for the warning about unsuitability for civilian and police use, it is a good warning for any purpose other than punching paper. The G.I. 130 grain .38 Special FMJ RN bullet is about as poor a choice as anyone could make for a self-defense load. Of course, the military have no choice but to use it because of the various conventions against military use of expanding bullets.
Falcon, by the time this ammo was made, I think the Air Force was already using a lot of Smith and Wesson Model 15s, especially in the Air Police, the revolver that originally was called the Combat Masterpiece. Pretty much just a Military & Police Model (Victory Model the same), but with adjustable rear sight and ramp front sight. A very good revolver. I am sure they had M&Ps and perhaps some military Victory Models (in .38 Special, not the .380 British (.38 S&W) caliber which was supplied to England) left in service, as well.