Well, you didn't have to wait until 21 if that's why you said all that stuff lol, 18 is good for one
Indiana has a License to Carry a Handgun (LTCH) not a CCW.
Firearms License FAQ:
http://www.in.gov/isp/files/firearms_FAQ_02_08.pdf
Not sure how active duty goes about getting one, but the best bet would be to call the Local PD or County Sheriff in your place of legal residence to ask them.