PUBLIC LAWS-CH. 393-AUG. 4, 1949 any such temporary appointment shall be included in determining length of service as a warrant officer or enlisted man. § 227. Promotion and dismissal of temporary commissioned officers The Secretary may, without regard to length of service or seniority, promote any temporary commissioned officer to a grade not above that of captain, and may call for the resignation of, dismiss, or reduce in grade, any temporary commissioned officer for unfitness, or misconduct, or when his services are no longer required. § 228. Appointment of commissioned warrant officers (a) The President may appoint, by and with the advice and con- sent of the Senate, permanent commissioned warrant officers in the Coast Guard, as the needs of the Coast Guard may require,-from among the following categories: (1) temporary commissioned officers of the Coast Guard; (2) temporary commissioned warrant officers of the Coast Guard; (3) temporary and permanent warrant officers of the Coast Guard; (4) enlisted men of the Coast Guard; (5) members of the Coast Guard Reserve; and (6) licensed officers of the United States Merchant Marine. (b) No person shall be appointed a commissioned warrant officer until his mental, moral, physical, and professional fitness to perform the duties of a commissioned warrant officer has been established as the result of such examinations as the Secretary shall prescribe. (c) Appointees under this section shall take precedence with other commissioned warrant officers in accordance with the dates of their commissions. Appointees whose dates of commission are the same shall take precedence with each other as the Secretary may determine. § 229. Revocation of commissions during first three years of commissioned service The President, under such regulations as he may prescribe, may revoke the commission of any officer on the active list who, at the date of such revocation, has had less than three years of continuous service as a commissioned officer in the Coast Guard, and each officer whose commission is so revoked shall revert to his former status or be separated from the Coast Guard. § 230. Compulsory retirement at age of sixty-two Any commissioned officer who has reached the age of sixty-two shall be retired from active service, with retired pay of the grade with which retired. § 231. Voluntary retirement after thirty years' service Any commissioned officer who has completed thirty years' service may, upon his own application, in the discretion of the Secretary, be retired from active service with retired pay of the grade with which retired. § 232. Voluntary retirement after twenty years' service Any commissioned officer who has completed twenty years' active service in the Coast Guard, Navy, or Marine Corps, or the Reserve Components thereof, including active duty for training, at least ten years of which shall have been active commissioned service, may, upon [63 STAT.