63 STAT.] 81ST CONG. , 1 ST SESS.-CHS. 38, 39, 41-MAR. 29, 30 , 1949 17 [CHAPTER 38] AN ACT March 29, 1949 To provide that acreage planted to cotton in 1949 shall not be used in computing [H. R. 128] cotton acreage allotments for any subsequent year. [Public Law 28] Be it enacted by the Senate and House of Representatives of the United States of America in Congress assembled, That, notwithstand- ing the provisions of title III of the Agricultural Adjustment Act of 1938, as amended, or of any other law, State, county, and farm acreage allotments and yields for cotton for any year after 1949 shall be com- puted without regard to yields or to the acreage planted to cotton in 1949. Approved March 29, 1949. [CHAPTER 39] AN AP0T Cotton acreage al- lotments. 52 Stat. 38 . 7U.S.C.§1301et seq.; Supp. II, § 1301 et seq. Post, pp . 670, 1057. March 29, 1949 To amend the Act of June 25, 1938, relating to the appointment of postmasters [H. R. 253] under civil service. [Public Law 29] Be it enacted by the Senate and House of Representatives of the United States of America in Congress assembled, That section 1 of the Act entitled "An Act extending the classified civil service to include postmasters of the first, second, and third classes, and for other pur- poses", approved June 25,1938 (52 Stat. 1076), as amended, is amended by striking out the following after the word "Provided,": "That postmasters now serving may continue to serve until the end of their terms, but they shall not acquire a classified civil-service status at the expiration of such terms of office except as provided in section 2 hereof", and inserting in lieu thereof the following: "That post- masters of the fourth class, appointed in the classified civil service, whose offices advance to a higher class, and postmasters of other classes, appointed in the classified civil service, whose offices are relegated to the fourth class, shall continue to serve under their original appoint- ment until a vacancy occurs by reason of death, resignation, retire- ment, or removal, in which event the appointment shall be made as provided in section 2 of the Act". Approved March 29, 1949. [CIAPTER 41] AN ACT To authorize the Secretary of the Air Force to establish land-based air warning and control installations for the national security, and for other purposes. Be it enacted by the Senate and House of Representatives of the United States of America in Congress assembled, That the Secretary of the Air Force is hereby authorized to establish and develop within and without the continental limits of the United States in fulfilling the air defense responsibilities of the Department of the Air Force such land-based air warning and control installations and facilities, by the construction, installation, or equipment of temporary or per- manent public works, including buildings, facilities, appurtenances, utilities, and access roads, and to provide for necessary administration and planning therefor, without regard to sections 1136, 3648, 3734, Revised Statutes, as he may deem necessary in the interest of national security: Provided, That not to exceed $85,500,000 shall be appro- priated for the construction of public works authorized by this section. SEC. 2. In furtherance of the above, the Secretary of the Air Force is authorized to make surveys and to acquire lands and rights pertain- ing thereto or other interests therein, including the temporary use 81939°--50 -PT. I -2 Postal Service. Postmasters fourth class. of 39U. S.C. §31a. lMarch 3. 19.19 .[It. . 25461 Pl'ublic Law 301 Land-based air warning and control installations. 10 U. S. C., Supp. 11, 1339; 31 U. S. C. §529;40U.S.C. 5§ 259, 267. Surveys, etc.