Believe it or not, I applied to all three at the same time. Eventually the AF recruiter found out about the Army, but had no idea about the Navy. In turn, the Army recruiter knew about the AF, but not about the Navy. The Navy guy knew about the AF, but not the Army.
The Navy guys told me that normally an applicant doesn't apply to more than one service at a time. When I asked why, they said that is the way it usually works.
The main snag point is the physical because supposedly only one branch can have a "certified" copy at a time.
The physical is the key that all services break to get a hold of because it keeps you from completing an applicant's packet with any of the other branches. To tell the truth, I can see why they would do this.
I was told by a retired Navy recruiter to apply to all three in case I didn't get my first choice. He was right because I didn't get the AF, but I am still waiting on the Navy and the Army.
The recruiters may get you to sign something called a "Spiff," (Form 680) which allows them to get the "original" physical. This opens up all other sorts of issues that we don't have time to go through.
I do hope this helps.
