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353 grade concerned in the approved report of the immediately preceding line selection board, and the denominator is the number of women line officers on the active list who are eligible in the fiscal year concerned for consideration for promotion to the grade concerned, exclusive of women line officers on the active list who were senior to the junior woman officer recommended for promotion to that grade in the approved report of the second preceding line selection board and exclusive of those officers junior to the junior woman line officer recommended for promotion to that grade in the approved report of the immediately preceding line selection board. I f the number so determined is a mixed number and the fraction is one-half or greater, the number that shall be furnished the board is the next higher whole number; if the number so determined is less than one, the number that shall be furnished the board is one. § 5764. Navy; male line officers: promotion zones (a) The Secretary of the Navy shall establish a promotion zone in each grade for male officers in the line of the Navy not restricted in the performance of duty when he convenes a selection board under chapter 543 of this title to consider officers in that grade for recommendation for promotion to the next higher grade. The promotion zone in each grade shall be composed of that number of the most senior such officers under consideration, who are eligible for selection for promotion to the next higher grade and who have not previously failed of such selection, that must either be selected for promotion by the particular board or be considered as having failed of such selection, in order to maintain a flow of promotion consistent with the terms of service set out in section 5768 of this title and in order best to assure to individuals in succeeding years equality of opportunity for promotion. The Secretary shall determine the number in the zone on the basis of a consideration of the number of vacancies estimated for the next higher grade in each of the next five years, the number of officers who will be eligible for selection in each of those years, and the terms of service that those officers will have completed. (b) The promotion zones in any grade below captain for male officers designated for engineering duty, for male officers designated for aeronautical engineering duty, and for male officers designated for special duty are each composed of all male officers of one such designation who have not previously failed of selection for promotion to the next higher grade and who are senior to the junior officer in the corresponding promotion zone for male line officers of the Navy not restricted in the performance of duty. (c) The Secretary shall establish a promotion zone in each grade for male officers in the line of the Navy designated for limited duty at the time he convenes a selection board under chapter 543 of this title to consider officers in that grade for recommendation for promotion to the next higher grade. The promotion zone shall be composed of that number of the most senior such officers under consideration, who are eligible for selection for promotion to the next higher grade and who have not previously failed of such selection, that must either be selected for promotion by the particular board or be considered as having failed of such selection, in order to maintain a flow of promotion consistent with the terms of service set out in section 5768 of"
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