Well I think everyone has covered your options as far as the AR15. I'll try and answer the Army or Air Force puzzle. To start, I've been in the Air Force for over 20 years. Now here is how to make up your mind. Ask each recruiter to take you on a tour of an active base. Ask to see the living conditions, try out the chow hall, see what's available for recreation. Make sure they let you ask questions of people you meet. Not just the ones they steer you towards. If furthering your education is an issue, don't just look at how much money is available but, will you have time to attend classes. DO NOT attend any kind of program where you receive "expense money" or an "allowance". If you receive any money from a service you can be banned from enlisting in the other services. When that's done you will find the Air Force has the highest standard of living, the best working conditions,the best access to education, and the majority of the high tech training. Good luck in your future.