Sarah congrats!! It is possible that PSA just doesn't have enough people who want Army GSO as a first preference to run a full FSP and so have filled up any remaining places with other candidates. Yes you should be chuffed that you're going down there!! If you are that concerned about it go ahead and make a phone call to PSA to clarify, preferably someone you have spoken to already. The flying side will be the same for everyone. Not too sure about your board, but I bet it'll be similar to what others have been through.
To you other guys, congrats on your achievements!!