I'll throw the flag on this one.  I just got back from overseas w/dependents, believe it or not as an IG.  I dropped papers as soon as I got feet dry in CONUS.  AFPC had a shit fit, but when I showed them their own reg i.e. OCONUS-CONUS is only 12 months, they backed down.  I've got the retirement orders to prove it.  FYI.