Gears, do you know any of the specifics about his situation? Rate and Rank? How long had he been in the reserves before trying to make the switch? Was he trying to get stationed in a specific region or area, or just anywhere there was an open spot?
I know it's really hard to tell whether or not you'll be able to switch because it's dependent upon what need there is in active duty and reserves. So if there's a DC3 and an MKC who are both trying to switch to reserves, and there's a need for a DC3 but not an MKC, then the reservist who is a DC 3 will have a much easier time switching than someone who is an MKC because of the needs of the CG. Or if you are picky about where you'd like to be stationed, vs someone who doesn't care where they go, so long as they get in, etc.