Was that because of the pot, or the fact that it’s illegal? I was in the Army and Navy before there were drug tests, it changed just before I got out. I never saw a difference in how our ships performed. I would say that probably 50% of the E-5s and below used pot/hashish and if you looked at the difference between the senior enlisteds and lower ranks in a liberty line at 0200, the ones on their hands and knees puking, getting in fights and falling asleep, were the ones that were drunk, while those that got high, were laughing and eating.
When the USAF did random testing, we would have side bets in our squadron. I was better than 60% on my guesses. The IDGAS attitude and personal appearance violations were the first manifestations.
Our worst problems were also E-5 and below. At that E-5 point, most had to grow up because of the responsibility and career path.
Agree on the alcohol users. They were pretty sloppy.