Officers or Enlisted Soldiers who serve on qualified active duty assignments on or after 28 January 2008 can draw their retirement pay earlier than age 60 but no lower than age 50 if they have qualifying periods of service.
For every 90 days of active service retirement age is reduced 3 months.
10 USC 12301(a), 12302, 12304, 12305, 12306, 12301(d)
Fulltime National Guard when under a call to active service by Governor and authorized by the President or Secretary of Defense under 32 USC 502 (f) or 115
DD 214
Mobilization orders or active duty orders
LES or MMPA
DD 220
Contact your unit or the GAARNG RPAM section at ng.ga.gaarng.list.ngga-g1-rpam@army.mil