312 number of officers of that grade for whom vacancies exist in the grade of commander but whose promotion to the grade of commander has been delayed for any reason. ( f) For the purpose of this section— (1) each officer is counted in his permanent grade; and (2) women officers appointed under section 5590 of this title are not counted. § 5450. Regular Navy: retired flag officers on active duty (a) Except in time of war or national emergency, not more than ten retired officers of the Regular Navy in the grade of rear admiral and above may be on active duty. (b) This section does not apply to fleet admirals or to retired officers ordered to temporary active duty to serve on boards convened under chapter 543 of this title. §5451. Suspension: preceding sections (a) Except as provided in subsection (b), the President, during a war or national emergency, may suspend any provision of the preceding sections of this chapter. Such a suspension may not contmue beyond June 30 of the fiscal year following that in which the war or national emergency ends. (b) The President may suspend provisions of sections 5442, 5443, and 5444 of this title relating to officers serving in grades above lieutenant in the Navy or captain in the Marine Corps only during a war or national emergency declared by Congress or the President after May 5, 1954. § 5452. Navy: women line officers on the active list; permanent grade The numbers of women officers on the active list in the line of the Navy holding permanent appointments in the grades of commander and lieutenant commander may not exceed, respectively, 10 percent and 20 percent of the number of women officers on the active list in the line of the Navy. The Secretary of the Navy, as of January 1 of each year, shall compute the number of women officers authorized under this section to hold permanent appointments in each of these grades. The number so determined for each grade is the number of women officers on the active list in the line of the Navy prescribed for that permanent grade. The Secretary may, however, determine a lesser number for each grade. A lesser number so determined becomes the prescribed number for the grade concerned until the next annual computation is made. During the period between one annual computation and the next succeeding computation, the number of officers prescribed for the grade of lieutenant commander, as computed or determined under this section, is temporarily increased by the number of officers of that grade for whom vacancies exist in the grade of commander but whose promotion to the grade of commander has been delayed for any reason.