DI was Drill Instructor but the rest of it I;ve been there and done that. When I was 15 I was sitting at bars drinking beer. 2 bucks would get about 15 old time glasses of beer with enough left for a tip.
Where I lived in NYS it was tough to do that at even 17.
You needed a picture ID to drink even though they didn't put pictures on drivers licenses in those days.
I paid the county $8 to make me an picture ID so I could buy alcohol at 18.
I didnt drink much till then but my younger brother was going to keg parties at 15, most outdoors. And it wasnt good for him either,