I travel not too far from Ft Drum, NY and most everytime I eat out, I will offer to buy a GI his lunch, shake his hand, and thank him for his or her service to our great nation. Most of them usually say "thanks, you don't need to do that", but I feel better making a small contribution to society.
I would have a hard time with doing it with alcohol, not so much as on moral grounds, but because of the alcohol related accidents. I would feel terrible if I helped contribute to that.
While you and I can probably control what we would do with a drink, I could never second guess a stranger.
Regardless of all of your personal feelings about alcohol and what the bible teaches us, please do what you can afford, to help others.
The Hermit