I've decided I'm going to join the Coast Guard after school

Thats true. I guess what I meant with the Marines/Army is that I'd be disappointed and bored that I wouldn't be able to use my training and make that difference. I would hate going through boot camp, infantry training, completing mos only to spend my time training every day without being able to put that to use.

With the Coast Guard you put in your 4-6 months as an apprentice, wait to get sent the school of your choice, go to that school and when you finally complete it you go straight to work in that field.

The careers in the Air Force just aren't what I'm interested in. The careers are either administrative, electronic, or mechanical and thats just not what I'm into.