Can you joint the military if your very fat?

I have a dark beard. i was in the military and shaved twice a day during boot camp. for the rest of my career once a day was enough.

No, anyone who served is a veteran.

No it is not a factor.

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

COPD will bar you from military service

Yes, as long as you are practicing medicine in the service.

there is no "law" against civilians rendering a hand salute. some already do,i.e. Boy and Girl Scouts, Police, Firefighters.
The typical or recommended salutes are guidance written into the flag code which describes flag etiquette. just as there is no law that says the flag shall never touch the ground, it is etiquette and respect that guides us.

no.

I recommend joining the Air Force if you want to become a pilot however, people don't just become pilots after having a Bachelors. You have to meet the requirements, pass the exams and be medically cleared and in shape, this applies to all branches. On the other hand its a challenge that only you can decide. I recommend talking to the nearest recruiter.