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338 in the corps concerned on the active list or the retired list, and each board convened under this section to consider oflScers in the Medical Service Corps or the Nurse Corps shall be composed of officers of the Regular Navy in the Medical Corps on the active list or the retired list. (c) When there is an insufficient number of staff corps officers lefi^ally and physically qualified to serve on a board convened under this section, the Secretary shall complete the minimum required membership by appointing as members of the board officers on the active list in the line of the Navy serving in the grades prescribed in subsection (a). (d) When officers of the Naval Reserve are eligible for consideration by a selection board convened under this section, the Secretary shall appoint an appropriate number of reserve officers, otherwise qualified under this section, as members of the board and shall appoint officers of the Regular Navy, qualified under this section, to complete the prescribed membership, (e) Each board prescribed in this section shall be convened at least once each year as soon as practicable after the report of a corresponding selection board for line officers has been approved by the President and at such other times as the Secretary directs. However, a board to recommend officers in the Medical Service Corps for promotion to the grade of captain and boards to recommend officers in the Nurse Corps for promotion to the grades of commander and lieutenant commander need not be convened unless there is a vacancy in the grade concerned or the Secretary estimates or determines that a vacancy will occur during the next 12 months. (f) No officer may be a member of two successive boards convened under this section for the consideration of officers for promotion to the same grade or for the consideration of captains for continuation on the active list. §5703. Marine Corps; officers: promotion and continuation on the active list (a) At least once each year the Secretary of the Navy shall convene the following selection boards to recommend male officers of the Marine Corps for promotion and for continuation on the active list: (1) A board to recommend colonels designated for supply duty for continuation on the active list, consisting of nine officers serving in the grade of brigadier general or above. (2) A board to recommend brigadier generals for promotion to the grade of major general, consisting of nine officers holding permanent appointments in the grade of major general or above. (3) A board to recommend colonels for promotion to the grade of brigadier general and a board to recommend lieutenant colonels for promotion to the grade of colonel, each consisting of nine officers serving in the grade of brigadier general or above. (4) A board to recommend majors for promotion to the grade of lieutenant colonel, consisting of three officers serving in the grade of major general or brigadier general and six officers serving in the grade of colonel. (5) A board to recommend captains for promotion to the grade of major and a board to recommend first lieutenants for pro-
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