; (B) may, by regulation, prescribe a period of time, not to exceed one year, from the time an officer on the Space Force officer list transfers on or off of sustained duty during which the officer shall be ineligible for consideration for promotion; and (C) may, by regulation, preclude from consideration by a selection board by which the officer would otherwise be eligible to be considered, an officer who has an established separation date that is within 90 days after the date on which the board is to be convened. (3) (A) The Secretary of Defense may authorize the Secretary of the Air Force to preclude from consideration by selection boards for promotion to the grade of brigadier general, officers in the grade of colonel who— (i) have been considered and not selected for promotion to the grade of brigadier general or by at least two selection boards