; and (4) the number of officers that should be placed in that promotion zone in each of the next five years to provide to officers in those years relatively similar opportunity for promotion. 20239. Promotions: how made (a) Promotion lists (1) Placement of names on promotion list When the report of a selection board convened under section 20211 of this title is approved by the President, the Secretary of the Air Force shall place the names of all officers approved for promotion within a competitive category on a single list for that competitive category, to be known as a promotion list, in the order of the seniority of such officers on the Space Force officer list or based on particular merit, as determined by the promotion board, or as modified by the Secretary of the Air Force under section 20217 of this title. (2) Time of establishment of promotion list A promotion list is considered to be established under this section as of the date of the approval of the report of the selection board under paragraph (1). (b) Promotions; how made