PUBLIC LAWS-CH. 393-AUG. 4, 1949 40 Stat. 608. 33U. .C.§§763- 76.5. Post, pp. 563, 1026. Ante, p. 497. 50U. S.C . app.§601 note. 60 Stat. 1097. 5 U. S. C. 133y-16 note. 50U. S. C . app.§ 601 note. 60 Stat. 1097. 5 U.S. C. §133y-16 note. Accrued military leave. may be authorized, which may be prescribed either as a fixed differ- ential or as a percentage of the basic compensation otherwise appli- cable to such employees. In no case shall basic compensation exceed $3,750 per annum, except that nothing contained in this subsection shall operate to decrease the basic compensation of any person employed by the Coast Guard on the date of enactment of this sub- section, and in no case shall additions thereto exceed 25 per centum of such basic compensation. Provision may be made for compensa- tory absence from duty when conditions of employment result in con- finement because of isolation or in long periods of continuous duty; and provisions may likewise be made for extra allowance for service outside of the continental limits of the United States. The additional compensation authorized herein shall be included in any computation of compensation for purposes of the Lighthouse Service Retirement Act. § 433. Personnel of former Bureau of Marine Inspection and Navigation and Bureau of Customs (a) Included in the two thousand two hundred and fifty commis- sioned officers authorized by section 42 of this title shall be four hundred and fifty-three extra numbers to which the President is authorized to appoint only the personnel of the former Bureau of Marine Inspection and Navigation and Bureau of Customs who on March 1, 1942, held the civil service rating of CAF-9 or P-3, or above. In the event that any person from among the personnel eli- gible to fill such extra numbers does not qualify, or who, being quali- fied does not accept a commission, the extra numbers not so filled shall be reserved pending the separation of such persons from the Coast Guard by retirement, transfer, resignation, death, or other cause. Upon such separation, each vacancy so reserved, and each vacancy created by the unavailability for appointment of such per- sonnel, or by the retirement, resignation, death, or other separation from the active military service of the Coast Guard of such personnel, shall increase by one the authorized number of line officers, and decrease by one the authorized number of extra numbers. (b) Any person commissioned from the personnel of the former Bureau of Marine Inspection and Navigation and Bureau of Customs who on March 1, 1942 held civil service rating of CAF-9 or P-3, or above, shall be an extra number in any rank to which he may be pro- moted. He shall be eligible for promotion, if otherwise qualified, at such time as the regular line officer who is his running mate becomes eligible for promotion, and shall be examined only with respect to those qualifications which pertain to his specialty. (c) No personnel of the former Bureau of Marine Inspection and Navigation and Bureau of Customs who were transferred from those bureaus to the Coast Guard by Executive Order 9083 and by Reorgani- zation Plan Numbered 3, effective July 16, 1946, shall be required to undergo further professional, physical, or mental examinations as a prerequisite to original commissioning, appointment, or enlistment, and the physical standards for such personnel while serving in the Regular Coast Guard shall not be greater than those applicable gen- erally to civilian employees under civil-service laws and regulations. (d) Any personnel of the former Bureau of Marine Inspection and Navigation and Bureau of Customs transferred from those bureaus to the Coast Guard by Executive Order 9083 and by Reorganization Plan Numbered 3, effective July 16, 1946, who enlist in the Coast Guard shall be subject to the provisions of subsection (c), and (e)-(h) of this section. (e) Accrued military leave of any personnel of the former Bureau of Marine Inspection and Bureau of Customs transferred from those 528 [63 STAT.