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<p>The entire intelligence apparatus for the US is very complex. There is a vast array of alphabet soup agencies dipping their feet into the intelligence gathering business.</p>
<p>As for the Military Intelligence CMF (Career Management Field in the Army, there are very limited slots at the 2LT level. MI is shaped like a stovepipe. The vast majority of slots for a MI officer are for CPT, MAJ, and LTCs. However, most people who want to branch MI may not necessarily want to be doing MI but they are after the TS clearance. MI is the only basic branch that requires its 2LTs to have a TS clearance. The TS clearance is worth a premium in the private sector if you are being employed by a defense contractor. However, I do not know if the TS clearance transfers over to the CIA. The federal organization that does the TS clearance is OPM (Office of Personnel Management). I know for a fact that if I had a TS clearance under the DoD it is still not transferable to the DoJ for example.</p>
<p>The best advice I have for you is that the Infantry branch offers the most opportunity for specialized assignments and the most opportunity for advancement. The vast majority of flag officers in the Army have Infantry as their basic branch. I have seen many Infantry officers re-branch to a combat support or combat service support branch but I have never seen CS or CSS officers command a MFE unit unless they were SF in which case they are awarded the 11A and 18A CMF identifier.</p>