308
308 (d) Of the numbers of officers prescribed for grades below captain, as computed or determined under subsection (b), not more than the following percentages may be officers designated for limited duty: (1) Commander—36%QQ percent. (2) Lieutenant commander—86%oo percent. (3) Lieutenant—^7'^%oo percent. (4) Lieutenant (junior grade) and ensign combined—6%oo percent. (e) The Secretary, as of January 1 of each year, shall compute the number of officers designated for limited duty authorized under subsection (d) for each grade above lieutenant (junior grade) and for the combined grades of lieutenant (junior grade) and ensign. The Secretary shall also determine the number of such officers, not to exceed the computed number, that will be required to meet the needs of the service during the ensuing year in each grade above lieutenant (junior grade) and in the combined grades of lieutenant (junior grade) and ensign. The number so determined is the prescribed nunmer for the grade or grades concerned. (f) The number of officers on the active list designated for engineering duty, aeronautical engineering duty, and special duty holding permanent appointments in the grade of rear admiral may not exceed 13 percent of the number of officers prescribed for the grade of rear admiral as computed under subsection (b). The Secretary, as of January 1 of each year, shall compute the number of officers authorized by this subsection to hold permanent appointments in the grade of rear admiral. The number so computed is the number of officers on the active list, restricted in the performance of duty, prescribed for the permanent grade of rear admiral. However, except in time of war or national emergency, the total number of officers on the active list, restricted in the performance of duty, holding permanent appointments in the grade of rear admiral may not exceed 19. (g) The numbers of officers on the active list designated for engineering duty, aeronautical engineering duty, and special duty, respectively, holding permanent appointments in the combined grades of captain, commander, and lieutenant commander may not exceed the following percentages of the sum of the numbers of officers prescribed for those grades as computed or determined under subsection (b): (1) Engineering duty—9 percent. (2) Aeronautical engineering duty—5 percent. (3) Special duty—6 percent. The Secretary, as of January 1 of each year, shall compute the number of officers designated for engineering duty, aeronautical engineering duty, and special duty, respectively, authorized under this section to hold permanent appointments in these combined grades. The number so computed for each designation is the number of officers of that designation on the active list prescribed for these combined permanent grades. (h) The prescribed numbers of officers computed or determined under this section may not be varied between computations. However, the prescribed number for a grade is temporarily increased during the period between one annual computation and the next succeeding computation by—
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