PUBLIC LAWS--C. 512 -AUG. 7 , 1947 of lieutenant (junior grade) and ensign, as provided in subsection (a) of this section, and shall determine the number of such officers in each of such various grades, and in the combined grades of lieutenant (junior grade) and ensign, not to exceed such maximum number, required to meet the needs of the service during the ensuing year, and the resulting number of each of such various grades, and in the combined grades of lieutenant (junior grade) and ensign, as so deter- mined, shall be held and considered for all purposes as the authorized number of such officers in each of such various grades, and in the combined grades of lieutenant (junior grade) and ensign, and shall Reduction in grade, not be varied between such determinations: Providedfurther That no etc. officer shall be reduced in grade or pay or separated from the active list of the Navy as a result of any such computation or determination: Adjustment. And provided further, That notwithstanding the provisions of this subsection relating to the authorized number of officers in grade, in order to make adjustment for the number of officers originally appointed each year in any grade pursuant to titles I through IV of this Act or to other provisions of law, the authorized number of officers in each grade concerned may be temporarily exceeded by such number of original appointments in such grade until the next succeed- ing annual computation authorized by this subsection shall be made. Final fraction. (g) Whenever a final fraction occurs in any computation made pursuant to this title, the nearest whole number shall be taken, and if such fraction be one-half the next higher whole number shall be taken. PROMOTION BY SELECTION; RETENTION OF REAR ADMIRALS 34 U.. C. s3. SEC. 104. (a) Subject to the provisions of section 1508 of the Revised Statutes, all promotions to grades above that of lieutenant (junior grade), including the promotion of those officers who are, or may be, carried on the Navy list as additional numbers in grade, shall be only upon the recommendation of a board of naval officers as herein prescribed. (b) Rear admirals, not restricted in the performance of duty, who complete four years of service in that grade and thirty-four years of total commissioned service shall, subject to the provisions of subsec- tion 107 (a) of this title, be continued on the active list only upon the recommendation of a board of naval officers as prescribed by titles I through IV of this Act. SELECTION BOARDS ear admiral and SEC. 105. (a) A board for the recommendation of rear admirals for continuation on the active list shall consist of five rear admirals, or officers of higher rank, senior to any officer under consideration. Boards for the recommendation of officers for promotion to the grades of rear admiral and captain, and for the recommendation of captains for continuation on the active list, shall consist of nine rear admirals; Commanders. a board for the recommendation of officers for promotion to the grade of commander shall consist of three rear admirals and six captains; Lieutenant com- and boards for the recommendation of officers for promotion to the tenants. grades of lieutenant commander and lieutenant shall consist of nine oreiers dested officers above the grade of commander. Whenever officers designated dalduty. for engineering duty, aeronautical engineering duty, or special duty are eligible for consideration by a selection board for promotion or for continuation on the active list, the Secretary of the Navy shall appoint, as alternate members of the appropriate selection board, three oficers of the same designation and classification as any such eligible officer, and if there be not three available he shall so appoint such lesser number as shall be available, and the junior members who are not restricted in the performance of duty, in like numbers, shall not [61 STAT.