293 Senate, for a term of four years, from officers on the active list of the Marine Corps in the grade of brigadier general who are designated for supply duty. (b) The Quartermaster General, while so serving, has the rank of major general. However, he is counted as a brigadier general designated for supply duty for the purposes of sections 5443 and 5448 of this title. §5205. Heads of Staff Departments: retirement An officer who is retired while serving as head of a staff department of the Marine Corps, or who, after serving at least two and one-half years as head of a staff department, is retired after completion of that service while serving in a lower grade or rank, may, in the discretion of the President be retired with the grade equivalent to the highest grade or rank held by him as head of a staff department and with retired pay based on his retired grade. §5206. Director of Women Marines: detail; retirement (a) A woman officer on the active list of the Marine Corps serving in a grade not below major may be detailed to duty in the Office of the Commandant of the Marine Corps to assist the Commandant in the administration of women's affairs. While so serving, she has the rank of colonel and is entitled to the pay and allowances of an officer serving in that rank. Her permanent status as a commissioned officer is not disturbed by her detail under this section. (b) An officer detailed as an assistant to the Commandant under subsection (a), who becomes 50 years of age while serving as such assistant, may be retired by the President on the first day of the month following that in which she stops serving as such assistant. (c) Each officer detailed as an assistant to the Commandant under subsection (a) who, while serving as such assistant, becomes 55 years of age or completes 30 years of active commissioned service in the Marine Corps shall be retired by the President on the first day of the month following that in which she attains that age or completes that service, whichever is earlier. (d) An officer detailed as an assistant to the Commandant under subsection (a), who has served at least two and one-half years as such assistant, and who is retired for any reason, either while so serving or after completion of that service while serving in a lower grade or rank, may, in the discretion of the President, be retired with the grade of colonel and with retired pay based on that grade. (e) Unless given a higner grade under subsection (d) or another provision of law, an officer retired under this section shall be retired in the permanent grade held by her at the time of retirement. (f) Each officer who is retired under this section is entitled to retired pay at the rate of 2i^ percent of the basic pay to which she would be entitled if serving on active duty in the grade in which retired multiplied by the number of years of service creditable for basic pay, but the retired pay may not be more than 75 percent or less than 50 percent of the basic pay upon which the computation of retired pay is based. I n determining the number of years to be used as a multiplier under this subsection, a part of a year that is six months or more is counted as a whole year and a part of a year that is less than six months is disregarded.