It depends which country you live in and where you have citizenship. But if you're a US citizen, residing in the US, you can get a lot of information about enlisting in the army...and even apply...
This is a personal decision based on what you hope to do and hope to gain from the experience. While the Army can mean you may see more places, the Air Force usually assigns service members to...
Realistically it depends on what the disability is for, you have to consider if you are current receiving disability you are restricted from preforming certain tasks which could prevent you from...
John Simpson Kirkpatrick, at the outbreak of World War I, immediately joined the Australian Army Medical Corps as a stretcher bearer under the name of "Jack Simpson".
You can, as long as you have parental consent (parents must sign a consent form) and be a High School Senior in good standing or expecting to graduate with your class.