What is it like living on base?

Without much detail, this sounds like "I am in the Army and looking for a wife, and I love you very much scam'. These are African males looking to get access to your bank account, or have you send them money as a short term loan for any number of made up excuses. I only noticed your 2018 question today, so I hope you didn't fall for it. Quora.com is full of similar stories.

I knew a career major in the Gurkha Regiment who remained single until the day he died. He worked for M.O.D. and Ford afterwards.

No as you have already signed up with another branch of the military

Is it silly to wear an NFL team jersey if you are not on the team? It is just a way of showing support.

Use whatever the Army issues to you.

yes you can get a bad conduct discharge which can impact your future employment.

COPD will bar you from military service

No.

it depends on your re-enlistment code in your record. contact your nearest recruiter.

do not lie. It is a felony to lie on enlistment applications and paperwork. also you will want your wife to have medical coverage and the other benefits associated with being a military spouse.
DO NOT LIE.

Do you like sleeping in the mud or in a hot tent - join the Army.
If you want an air conditioned bed on a clean ship with hot showers - Go Navy.