I think that is extremely sweet of you.
Is he in the military? If so, then it is not wierd, you are a loving sister. If he is not, then you may be overly protective. If you live in South Central, I hope you move him to a better life.
Depends on why you're scared that he'll get hit by bullets.
kevlar isn't exactly tough to find: http://www.safeguardclothing.com/15-bullet-proof-vests/