US-Subs, I remember CS-2 in a pumper that went into the hole of a bunker. I also think that a CS-1(?) may have been used in aircraft delivery bomblettes? I am confused here on your CS-2 and maybe a CS-1? Help me out here.
I have a couple inert CS & CN grenades that go back to the early 60's and were military issue then. I do however remember the CS grenades being used allot more often that CS-2. Either way you should mask up when handling these devices if they are real.
The US loaded CS in just about everything you can imagine for use in Viet Nam. Initially the reasoning was that we could use it for the rescue of downed pilots and POWs - blanket the area, the enemy has little or no protective equipment, we swoop in and save those in need. Noting the near total lack of protective equipment however, the use expanded, and soon loadings became much more varied.
To list all of the loadings would take too much time here and now, but we put it into 105mm, 155mm, 4.2-inch, 2.75 rockets, 66mm rockets (similar to the flash 202 but pressurised with nitrogen), several types of submunitions (BLU-39/E49/M16, XM100, M54, XM693, etc) and even a converted firebomb body. Pump rigs were adapted for tunnel and helicopter use, flamethrowers were converted, grenades, mini-grenades, 40mm grenades, candles -
Using it as area denial, we could just not get it on the ground fast enough. Eventually we just adapted a burste tube, attached a firebomb all-ways fuze and pushed the bulk drums straight out of the back of C130s.
A few years back I spent some time in Viet Nam, at a number of the sites where they had buried much of what was leftover on the departure of the US. 10 tons here, 10 tons there - an amazing mix of munitions pulled out of the ground.
Normally CS-2 was in bulk, or loaded into pumpers/sprayers as you described. I've seen drums marked with it (2 red bands vs 1) and 1 single 155mm, but that is it. Munitions filled were marked with two red bands and "Tactical CS", normally shortened to Tac CS.
Interesting about the ABC M25 is that you sometimes see them with a yellow band to indicate the burster charge. I had never seen this until about 93, when they started to show up for destruction. The explanation we were given was that it was just a new marking. This turns out to be incorrect, as I saw thousands in VN, all with the band and none without.
I'll attach some photos for more clear info. JO