61 STAT.] 80TH CONG., 1ST SESS.-CH. 512-AUG. 7,1947 act upon the cases of officers designated for engineering duty, aero- nautical engineering duty, or special duty. No such alternate member shall act upon the cases of officers other than those of the same designa- tion as himself. No officer designated for engineering duty, aeronau- tical engineering duty, or special duty shall act upon the cases of officers not restricted in the performance of duty. (b) The officers composing these boards shall be officers on the active list of the Navy. No officer may be a member of two successive selection boards for the consideration of officers for promotion to the same grade, or for the consideration of officers for continuation on the active list in the same grade. (c) These boards shall be appointed by the Secretary of the Navy and convened at least once each year and at such times as the Secre- tary of the Navy may direct. OATH FOR MEMBERS OF SELECTION BOARDS SEc. 106. Each member of a board provided for in section 105 of this title shall swear or affirm, that he will, without prejudice or partiality, and having in view both the special fitness of officers and the efficiency of the naval service, perform the duties imposed upon him as herein provided. ELIGIBILITY OF OFFICERS FOR CONSIDERATION BY SELECTION BOARDS SEC. 107. (a) Rear admirals, not restricted in the performance of duty, who, at any time during the fiscal year in which this title becomes effective or at any time during any subsequent fiscal year, first attain the status of having completed four years of service in grade and thirty-four years of total commissioned service shall become eligible for consideration by a selection board convened in such fiscal year for recommendation for continuation on the active list: Provided, That such a rear admiral who at any time shall have lost numbers or precedence shall become eligible for such consider- ation in the fiscal year in which the most senior rear admiral junior to him who shall not have lost numbers or precedence becomes eligible therefor: Provided further, That such eligibility shall continue until the officer concerned shall have been selected for continuation on the active list or until he shall have twice failed of such selection, which- ever shall occur earlier: Provided further, That a rear admiral who shall ha've been selected for continuation on the active list pursuant to title III of this Act shall not be considered for selection for contin- uation pursuant to this subsection. (b) Captains designated for engineering duty, aeronautical engi- neering duty, or special duty, within the following categories shall be eligible for consideration by a selection board for recommendation for continuation on the active list: (1) Those who have twice failed of selection for promotion to rear admiral, and (2) those who have failed of selection for promotion to rear admiral in the immediately preced- ing year and who are not recommended for promotion by the selection board concerned: Provided, That such captains who will complete thirty-five years' total commissioned service or who will attain the age of sixty-two years in the fiscal year in which such board is convened will not be eligible for consideration for continuation on the active list. (c) Officers shall be eligible for consideration by a selection board for promotion to the next higher grade when they will have completed, on June 30 of the fiscal year of the convening of the appropriate board, the following periods of service in the grades in which they are serv- ing: Captains, three years; commanders, five years; lieutenant com- manders and lieutenants, four years; lieutenants (junior grade), two 95347--48- -pt 1--1 801 Restrictions. Appointment, etc. Rear admirals. Poe, p. 829. Captains designated for engineering or spe- cial duty. Promotion to next higher grade, etc.