Is it possible for someone in the marines to train with people in the army/navy?

Question

is it possible for someone who joins the usmc be able to go to army airborne ranger school and navy underwater demolition school?

Answer 1

The Marines are technically a part of the Navy so I would say yes.  

Answer 2

I don't know why not, its to the military's benefit for u to get all the training u can

Answer 3

My brother which is in the navy does pt with people in the air force all the time since he is stationed on an air force base.