How competitive are NCP's?

Hello. I need any information from anyone who has it. I am a BSN student in my third year and I am looking into joining the military. I have been talking to a Navy recruiter and am currently working on my package for the Navy NCP program, but it looks like I waited to long and all the spots are taken. So I will probably have to wait until next year to join. From the little research I have done it looks like to me that the AF is the better option for nurses anyway, so not getting into the navy this year may be a blessing in disguise! Anyway, my questions are:

1. How competitive are these programs; is one branch more competitive than another? GPA, physical requirements, character/references, etc.

2. How competitive is it to get into CRNA programs once you are in the military; how does this work?

I've really got a few more questions but will quit bothering you guys now!