301
301 for limited duty authorized under subsection (c) for the grades of commander and lieutenant commander. The Secretary snail 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 of these grades. The number so determined for each grade is the number of officers designated for limited duty prescribed for the grade concerned. (e) At the time of making the computations required by subsection (b), the Secretary shall also determine the numbers of line officers on active duty, excluding officers carried as additional numbers in grade, that will be required to meet the needs of the service during the ensuing year in the grades of lieutenant, lieutenant (junior grade), and ensign. The numbers so determined are the prescribed numbers for these grades. (f) The number of officers designated for engineering duty, aeronautical engineering duty, and special duty serving on active duty 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 or determined under subsection (b). The Secretary, whenever the needs of the service require but at least once annually, shall compute the number of officers in the grade of rear admiral authorized under this subsection. The number so computed is the prescribed number of officers restricted in the performance of duty serving on active duty in the grade of rear admiral. However, if the Secretary determines at the time of making this computation that the number of officers designated for engineering duty, aeronautical engineering duty, and special duty required to meet the needs of the service in the grade of rear admiral is less than the prescribed number as computed, the lesser number becomes the prescribed number. (g) The number of officers designated for engineering duty, aeronautical engineering duty, and special duty, respectively, serving on active duty 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—5 percent. The Secretary, whenever the needs of the service require but at least once annually, shall compute the number of officers designated for engineering duty, aeronautical engineering duty, and special duty, respectively, authorized under this section for these combined gradejs. The number so computed for each designation is the number of officers of that designation serving on active duty prescribed for these combined grades. However, if the Secretary determines at the time of making these computations that the number of officers of any designation required to meet the needs of the service in the combinSi grades is less than the prescribed number as computed, the lesser number becomes the prescribed number of officers of that designation, (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 computation and the next succeeding computation by—
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