How do I go about getting my ALC school slot back?

You might call the school house and talk with them about a walk on. Many times there are no shows or cancellations, like in your case. Your ATARs manager or schools manager at the BN or BDE should also be able to see all available seats and help you. I recommend the Program managers in your COC route first before calling about walk on status.

Your best bet is to have your Schools NCO contact the NCOA operations cell. Your BN shcools NCO will also be valuable and may call on your (as well as others) behalf. So don't circumvent them, it may cause more confusion and duplication of efforts. More than likely the NCOA will tell them to push the 4187, but NCOA will give the most updated information for what needs to be put on the 4187. DA has a tight-hold on the ATTRS reservations, so involving your entire food chain will assist with over-watch as your request is processed.

I have an 11B ALC that will conduct towards the end of February. I get active guys all the time, ours is only 19 days in length and is OASS. If you're still in a bind I can take you as a walk on space permitting. We usually are never maxed out.