The result would be that military service would not be some exotic disruption of life but would be a normal stage to manhood. The military would have no dearth of enlistees, even in wartime because the rich kids and the college bound would not fear thatthe "draft" would retard their social and economic progress and most of all, the military life would be familiar and not outside of the "real world." Voluntary training could be offered universally to women that would train them in the use of personal firearms and self defense tactics for one to three month. Additional training such as is given in the military now would be life-saving training that would impart medic abilities to everyone.
I hope the above is not your idea, because it is the most unworkable idea I've ever heard. Male only? 16? New bureacracy between Selective Service and active military? 6 month draft, with 3 months Boot camp AND Advanced Infantry Training? No on post/ship duty station for real life training/experience? Draftees discharge after 6 months then permitted to enlist between one month and a year? Sure they'll be standing in line.
What about the technical training in all branches that sometimes take up to a year or more? Due respect, the above is unworkable. The above would be a waste of money and time.
I may go for a Reserve or National Guard draft but at 16? and a 3 month draft? That's not enough time to learn to turn individuals into cohesive team nor get in shape nor learn the very basics of combat or Navy seamanship. Hell, my first 3 months was just learning how to march in unison and square away my bunk. What nonsense.