Log on to AFPC secure from your gov computer and search for PSDM 11-21. It gives the RIF details and the eligible year groups. Anyone who is eligible for the RIF is eligible to apply for VSP. No public word on percentages of AFSCs or secretly "non-eligible" AFSCs, so it seems to be a free-for-all.

The thing that drives me crazy is that the clown in the 2002 year group with a DUI and an Article 15 will be allowed to remain in the AF while good dudes in the 2003 group may get RIF'd.