For ROTC, the det commander would be the one to put your name in originally for that nom...highly unlikely they are going to support you for a x-service nom. Additionally, you are only a freshman, so you probably have not proven yourself enough to the command for their support. Have you talked to the leadership in your det? They are the ones that will provide you the most accurate information on obtaining a ROTC nom, including the probability. Are you on a ROTC scholarship?
2 yrs ago DS opted ROTC scholarship over AFA, the det commander was fully made aware of this when we met them in the winter before he made his decision. The commander guaranteed us that if DS wanted to re-apply he would support him. In Sept a few weeks into the yr, he came to DS and asked if he wanted to reapply, he didn't. DS never approached him, but the commander remembered and fulfiilled his promise to us. The point is many ROTC cadets also tried for the SA, there are limited numbers that can be appointed through this method, I would ASSUME (and you know what ASSUME means), that our DS was not a rarity on the national level, but common place. Logic would state that @1500 candidates that apply for an SA with a nom, do not get an apptmt each yr, and that is just those, then there are those that did not get a nom, but were deemed qualified and now on ROTC scholarship.
The question still begs to remain why did you wait so long, since you knew the length of the process last yr? There is a difference for a freshly minted ROTC cadet that never entertained the thought of an SA, and one that went through it last yr.
All you need is one, I would think the Veep would be it, and maybe you can get pulled from there.
Sorry this was a johnny rain cloud post, but sometimes the need for realism needs to be inputted. You can still get in on a VEEP so it is not over...just think...you could be the kid that says I was the last batter up, bottom of the ninth, tied game, 2 outs, 3 balls, 2 strikes, nobody on base, and I hit the home run to win the WS. It does happen, not often, but it still does occur.