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authorized for brigadier general and major general under subsection (a) the difference may be applied as an increase in the prescribed number computed or determined under subsection (c) lor any grade. (c) The Secretary, whenever the needs of the service require but at least once annually, shall compute the number of officers authorized under subsection (a) for each of the grades of colonel, lieutenant colonel, and major. The number so computed is the number of officers on active duty, excluding officers carried as additional numbers in grade, prescribed for the grade concerned. However, if the Secretary determines at the time of making these computations that the number of officers required to meet the needs of the service in any such grade is less than the prescribed number for that grade as computed, the lesser number becomes the prescribed number for the grade and the reduction may be applied as an increase in the prescribed number for any lower grade. (d) Of the numbers of officers prescribed for the grades of lieutenant colonel and major, as computed or determined under subsection (c), not more than the following percentages may be officers designated for limited duty: (1) T-iieutenant colonel—36^1 oo percent. (2) Major—S62/^^^ percent. (e) The Secretary, whenever the needs of the service require but at least once annually, shall compute the number of officers designated for limited duty authorized under subsection (d) for the grades of lieiitPTinnt colonel and major. 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 of these grades. The number so determined for each grade is the number of officers designated for limited duty prescribed for the grade concerned. (f) At the time of making the computations required by subsections (b) and (c), the Secretary shall also determine the numbers of 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 captain, first lieutenant, and second lieutenant. The numbers so determined are the prescribed numbers for these grades. (g) The number of officers designated for supply duty serving on active duty in the grade of brigadier general, including the officer serving as Quartermaster General of the Marine Corps, may not exceed 13 percent of the sum of the numbers of officers prescribed for the grades of major general and brigadier general 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 brigadier general authorized under this section. The number so computed is the prescribed number of officers designated for supply duty serving on active duty in the grade of brigadier general. However, if the Secretary determines at the time of making this computation that the number of officers designated for supply duty required to meet the needs of the service in the grade of brigadier general is less than the prescribed number as computed, the lesser number becomes the prescribed number.
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