|Army Guard/Reserve Commissioned Officer Career Information|
By law, commissioned officers of the Reserve Components who are on the Reserve Active Status List (RASL) are automatically considered for promotion when they have served the required years in grade. Promotion consideration accrues whether officers are assigned to an ARNG unit, TPU or a control group, except for the Standby Reserve (Inactive) and the Inactive Army National Guard. RC officers assigned to an ARNG unit or USAR TPU have an additional opportunity for promotion to fill unit position vacancies at such time as they have completed the education and time-in-grade requirements. Time in grade requirements for vacancy promotions are contained in AR 135-155, table 2-1.
Above information derived from Army Pamplet 600-3