Whats the MGIB “top up”?
If you have served on Active Duty for at least two years, you may elect to use the Montgomery GI Bill (MGIB) “top-up” in addition to TA to cover high cost courses. You must serve at least two years on Active Duty before being able to use Chapter 30 MGIB benefits, including top-up. Sources include Military.com, EArmyU.com, USCG.mil, and AFreserve.com.