63 STAT.] 81sT CONG., 1ST SESS.-CH. 402 -AUG. 5, 1949 in lieu thereof the words "During the period that title III of this Act remains in effect"; and deleting in the second sentence of sub- section (h) of the said section the words "shall have completed service in the Navy" and substituting in lieu thereof the words "shall have been selected therefor prior to August 7, 1949, and shall have com- pleted active naval service, exclusive of active duty for training in a reserve component," SEC. 2. All commissioned officers of the active list of the United States Navy on active duty on the effective date of this Act, who on that date or within one year thereafter are designated for special duty in accordance with the provisions of section 401 of the Officer Per- sonnel Act of 1947, as amended, shall be credited for purposes of adjustment of lineal position, eligibility for selection for promotion, eligibility for promotion, eligibility for continuation on the active list and in respect to separation from the active list, pursuant to the provisions of that Act but not pay or retired pay, with a period of active service equal to the time spent in attendance at a professional school, or in graduate study at a college or university, in the attain- ment of education which is a requirement or an alternative require- ment of the United States Navy for qualification for designation for the performance of the special duty for which the officer is designated: Provided,That the maximum period of active service so credited shall be three calendar years, and shall not include any time spent in attend- ance at such professional school or in graduate study at such college or university while serving on active duty: Provided further, That no such period of active service shall be credited to those of such officers who, although required to hold a graduate degree, were originally and permanently appointed and commissioned in the line of the Regular Navy in the grade of lieutenant (junior grade) as officers designated for special duty, pursuant to section 408 of the'Officer Personnel Act of 1947, as amended: Provided further, That no officer who attended the United States Naval Academy shall be advanced, pursuant to this Act, to a lineal position senior to any member of his class who was as such senior to him and has not lost numbers or precedence. SEC. 3. As used in this Act, the term "time spent in attendance at a professional school, or in graduate study at a college or university" shall, for the purpose of establishing the active service credit authorized by this Act, be computed as follows: (1) Full-time, regular-session attendance at a college, university, or professional school for one academic year exclusive of summer or extra sessions, shall be con- sidered one calendar year; (2) full-time, regular-session attendance at a college, university, or professional school for a fraction of an academic year, exclusive of summer or extra sessions, resulting in the completion of the units of study undertaken during that period, shall be considered to be an identical fraction of a calendar year; and (3) part-time attendance at a college, university, or professional school, or attendance at summer sessions or other extra sessions, shall first be converted into an equivalent fraction of an academic year of full-time, regular-session attendance, and shall be considered to be an identical fraction of a calendar year: Provided, That, subject to the limitation contained in section 2 hereof, every officer entitled to the benefits of sections 2, 3, 4, and 5 of this Act who holds a professional or graduate degree, with the exception of an honorary degree, from a professional school or a college or university, which degree is acquired through attendance at a professional school or in graduate study at a college or university for a period of at least three academic years, and which degree is a requirement or an alternative requirement of the United States Navy for qualification for service in the special-duty-only classification for which the officer is designated, shall be credited 569 61 Stat. 829. 34 U. S.C., Supp. II, § 3c note. Crediting of active service for special duty. 61 Stat. 869. 34U. S. C., Supp. II, § 211b. Maximum period of active service. Restriction. 61 Stat. 873. 34U.S.C., Supp.II, §77. Computation of at- tendance time at pro- fessional school, etc. Credit of maximum period. Supra;post, p. 570.