A recent decision by the Department of the Army Human Resources Command has made a more reservists eligible for the Post-9/11 GI Bill. On February 10 MILPER message 17-059 was issued, stating that reservists who had certain types of active duty after September 10, 2001 may now use that time to qualify for the Post-9/11 GI Bill under 10 USC 12301(d). For more details, see this Military.com article.