Ah, what I love about being a librarian...

...access to random, sometimes useless, sometimes useful, often obscure information.

One of my colleagues on the solo librarian list sent out an appeal regarding the question of whether only children/only sons are exempt from the draft (here in the U.S.) After all, it's certainly a widely-held belief. The answer? No, although those who have had a sibling or parent die in the service are. And then there's the matter of whether it's a peacetime or wartime draft. Here's where to find the skinny:

http://www.sss.gov/FSsurviv.htm
http://www.snopes.com/military/onlyson.htm