; (ii) the Secretary determines the exclusion from consideration is in the best interest of the Space Force; and (iii) the officer has not previously failed of selection for promotion to the grade for which the officer requests the exclusion from consideration; or (B) (i) the officer is serving in a critical skill position that cannot be filled by another Space Force officer serving in the same grade; (ii) the Secretary determines that it is in the best interests of the Space Force for the officer to continue to serve in their current position and grade; and (iii) the officer has not previously opted out of a promotion board under this authority. 20232. Eligibility for consideration for promotion: designation as joint qualified officer required before promotion to brigadier general