My underdtanding is that 1) All MOS are open to Kings Pointers; 2) The OML is indeed used, as it is everywhere, though Kings Pointers generally fare well on that, and 3) there is a new program for those going Army that is also very good and open only to Kings Pointers, though I don't know the details.
All this information would best be clarified by the Active Duty Army Officer onboard the Academy who is the primary liason to that service. I suggest you look up or otherwise obtain their email and contact them with your specific question(s).