following the officer elects: (1) Transfer the officer in grade to the Space Force retired list, if the officer is qualified and applies for the transfer. (2) Transfer the officer in grade to a Space Force inactive status, if the officer is qualified. (3) Discharge the officer from the officer’s appointment and, if the officer is qualified and applies therefor, appoint the officer in the grade held by the officer as a before the officer’s appointment in a general officer grade. (4) Discharge the officer from the officer’s appointment. (b) Credit for service in grade An officer who is appointed under subsection (a)(3) shall be credited with an amount of service in the grade in which appointed that is equal to the amount of prior service in an active status in that grade and in any higher grade. IV Failure of Selection for Promotion and Involuntary Separation 20251. Failure of selection for promotion (a) In general Except as provided in this section, sections 14501, 14503, and 14504 and section 631 and 632 of this title shall apply to promotions of officers on the Space Force officer list. For the purpose of such applicability— (1) any reference in those sections to the reserve active-status list or the active-duty list shall apply to the Space Force officer list