Section, act Aug. 4, 1949, ch. 393, §1, 63 Stat. 522, limited number of retirements in a calendar year of enlisted men who had completed 20 years of service, to not more than the whole number nearest 1 percent of the total enlisted force on the active list, and any men so authorized to be retired annually who were not so retired, could be retired during any subsequent year providing the total retired in that year did not exceed 3 percent of the total enlisted force.