Grandpa served in WWII - all I know is that he sat in Florida, doing morse code. That 's about the extent of the knowledge I have about his service at that time. After the war he was in the reserves(I think), rising to the rank of colonel. He worked at Sandia Labs in Albuquerque, NM. At some point he was a shooting instructor, and I'm also told he was a crack shot back in the day. At some point, postwar, at the rank of captain, he served with the Artillery - I still have his '42 dated named map case. Never selling that thing, not for a million billion bucks.
My oldest uncle was two points away(his way of putting it) from being drafted for Vietnam, and has since expressed that he didn't mind if he'd never get lucky again - that was enough luck for a lifetime, as far as he was concerned.
My grandfather lost an eye as a kid, so he didn't get drafted, but my father did, in 1980. 9 months of service, training to repel the pesky Russians. One of my great-grandfathers was a corporal in the reserve at the outbreak of WWII, and at the time there was a lot of talk about the possibility of the Germans drafting Danish men, especially ones with military experience, which meant that he kept a low profile throughout the war.