Dunno. I'd be interested myself. I have a teenage girl currently busting a gut and doing everything in her power to get accepted into the Officer Training Programme.
I don't know of any specific "military as career" type of spreads, but the Tarot Spreads Forum Index lists a number of Job-related spreads in Post 3 and Decision-making spreads in Post 4. You might be able to tweak one of those to deal with the specific situation.
