My wife is an after-hours volunteer for the ARC in the Armed Forces Emergency Services area. Troll, I don't know the circumstances of your case, but I do know one thing that the ARC workers are trained very emphatically to tell callers is that, although the ARC can pass messages, etc., ALL leave decisions are up to the military. There is no way ARC can 'approve' military leave for any purpose whatsoever.
For the most part, ARC's role is in acting as an official conduit for varification that an emergency (death, serious illness, etc.) does in fact exist. Once that has been done it's up to the military to act on that information.