Active Duty GI BIll Eligibility
You must have first enlisted on or after July 1, 1985
You must have had a pay reduction of $1,200.00
You must have had continuous active duty equal to or greater than your initial enlistment period
Some VEAP participants were able to convert to the GI Bill during special conversion programs

Special rules for early discharges
Persons who were discharged early for:
reduction in force
disability
hardship
a physical or mental condition which interfered with duty
a medical condition which existed prior to service
are eligible for GI Bill entitlement for a time period that is the same as the number of months served.
Persons discharged for Convenience of the Government must serve 20 months of a 2 year enlistment or 30 months of a 3 year enlistment to be eligible for GI Bill benefits. (soure VA website)