On a related note, once you commission you may be asked questions about alcohol use again during a physical.
My younger son sat with the Doc during his flight physical at Rucker a while back. He was asked about his alcohol consumption, how many drinks/beers per week, how many at one sitting, and so on. He answered truthfully, as best he could.....maybe two beers a week (but not every week and never the night before he was flying) and maybe 3 or 4 in an evening if they were out for a weekend (not every weekend). The Doctor looked surprised he had answered in that way and told him he was 2 points off from having to go to an Alcohol Awareness class.
So, for a 23 year old he will have a beer sometimes when he won't be flying the next day, and as most flight students they take advantage of the weekend from time to time. Just be careful how you answer the questions when asked, as he said the Doctor put it "Be honest, just not too honest"