Having considered the military, I think enlistment should absolutely remain at 18 so you have time to rise in grade and get special training if your going to be a pilot etc. The problem with alcohol is Americans are too stupid at 18 (and even 21 in some cases) to drink responsibly... Which is a problem with Americans, not alcohol at 18 (or at least it doesn't seem to be a problem in Europe). If America made the drinking age 18, a quarter of our dumbass population would be drunk within 24 hours...