If he is a reserve recruiter, he can indeed put you in a fixed wing slot. Reserve units are like guard units, in that they have an assigned airframe. So if he is slotting you to a unit that only flies C-12's, then you are essentially guaranteed a fixed wing slot. Mind you, you will still go off to Rucker and spend a year going through the ENTIRE rotary track first (Primary and Instruments in the TH-67, Warfighter Skills in the OH-58, then an advanced aircraft course, the UH-60A/L more than likely since its the shortest advanced course). Then and only then will you get your wings, and then you will attend a roughly 3 month follow-on course to get checked out on fixed wing. You'lll start in a Cessna, move up to a Beech Baron, do a little aero in a Zlin, then move on to the C-12. It's run by Flight Safety international, and more than half of it is in the sims (They don't have any actual C-12's with glass, so after you get an initial checkout in the old school C-12 you will finish everything out in their C-12V sim, which is glass).

Hope this helps.