I worked in a Infantry One-Station Unit Training company at Ft. Benning from late 1997 to early 1999. There were no stress cards there, I guarantee you. Around the beginning of 1999, my unit (1-38 IN) transitioned into Basic Training (non-MOS specific) from Infantry OSUT. We got an influx of drill sergeants from Ft. Jackson - they didn't have them there either.
It amazes me that no one ever asks why NOT ONE of these cards has ever appeared.
Well, there was this one time, at mixed gender boot camp, when two of the trainees took the CO's HMMWV up onto a hill, and they were making out in the cab, when there was a noise outside, and the dude went out to check, and he didn't come back for, like, 5 minutes, and then a dripping noise started on the roof of the hummer, which was like totally freaking the chick out, so she got out and looked, and there was her late boyfriend hung upside down headless from a tree branch over the car.
Drip. Drip. Drip.
So she pulled out her stress card.
Hey, if it weren't true, there wouldn't be so many stories about it, would there?
= )