For Army ROTC Cadets many things go into whether you get Active, Reserve, or Guard. Most guys want active but some end up going reserve, most guard guys go guard. Your evaluation at LDAC, PMS letter, and accessions points(Airborne, Air Assault) all go into it. Plus you GPA. this is very important. You can also do a process of ADSO'ing(oweing the army more years of commitment) which will guarentee you a few things such as first duty station and branch. you cannot ADOS for Active duty.