I voted maybe, as it can be a good idea if, oh, I dunno, the parents stepped in early on and taught them that drinking responsibly is a good idea and driving while intoxicated is a bad one. However, given what I've seen of parents and their insistence on blaming everything but themselves or their hellspawn when said spawn does something horrible, it probably won't happen in the U.S. during my lifetime, if ever.
The military is another case. If you expect someone to voluntarily (or otherwise should the draft be reinstated) lay down their life for the country and your freedom, they should be allowed to drink. I've heard people say that I am giving special treatment to servicemen because of these thoughts, which is probably true, but a lot of these are the same people who also mention if they covered themselves in body glitter and introduced themselves as Edward, then they'd score with any girl they want. Bleh.
Sorry for rambling like this.