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 220 Base rate of pay. Exception. Designated trans- portation provisions not to apply. 48 Stat. 933; 49 Stat. 614. 39U.S.C.§469; Supp. III, ch. 13. Number of con- tracts limited. PUBLIC LAWS-CHS. 157, 167, 168-APR. 15, 22 , 25, 1938 [52 STAT. authority of this section: Provided further, That the base rate of pay which may be allowed in awarding such contracts shall not exceed 20 cents per airplane-mile for a load not exceeding two hundred and fifty pounds of mail, and not exceeding 1 cent per air- plane-mile for each twenty pounds of mail carried in excess of the two hundred and fifty-pound limit, except that in the discretion of the Postmaster General a higher base rate of pay may be allowed in awarding contract for carrying mail over circuitous routes of less than seventy-five miles in length: And provided further, That the provisions of the Act of June 12, 1934 (48 Stat. 933), as amended by the Act of August 14, 1935 (49 Stat. 614), shall not apply to the transportation of mail under this section: And provided further, That the Postmaster General shall not award more than five con- tracts for the transportation of mail under the authority of this section. Approved, April 15, 1938. [CHAPTER 167] April 22, 1938 [S. 3590] [Public, No. 487] National Defense Act, amendments. 41 Stat. 762. 10 U.S. C. §§27,28, 532. General Staff Corps, assignments in peace time. Line officers, serv- ice requirements. Officers below brig- adier general, service with troops. Proviso. Officers commis- sioned in a staff corps. April 25, 1938 [H. R. 9257] [Public, No. 4881 Saint Clair River. Time extended for bridging, at Port Huron, Mich. AN ACT To amend an Act entitled "An Act for making further and more effectual pro- vision for the national defense, and for other purposes", approved June 3, 1916, as amended by the Act of June 4, 1920, so as to make available certain other officers for General Staff duty. Be it enacted by the Senate and House of Representatives of the United States of America in Congress assembled, That the fifth sen- tence of section 4 (c) of the Act entitled "An Act for making further and more effectual provision for the national defense, and for other purposes", approved June 3, 1916, as amended by the Act of June 4, 1920, be, and the same is hereby, further amended to read as follows: "In time of peace no officer of the line shall be or remain detailed as a member of the General Staff Corps unless he has served for two of the next preceding six years in actual command of, or on duty other than General Staff duty, with troops of one or more of the com- batant arms or as instructor with the National Guard, Organized Reserves, or Reserve Officers' Training Corps; and in time of peace every officer serving in a grade below that of brigadier general shall perform duty with troops of one or more of the combatant arms for at least one year in every period of five consecutive years, except that officers of less than one year's commissioned service in the Regular Army may be detailed as students at service schools: Provided, That an officer commissioned in a staff corps shall not be or remain detailed as a member of the General Staff Corps unless he has served for one of the next preceding five years with troops of one or more of the combatant arms or as instructor with the National Guard, Organized Reserves, or Reserve Officers' Training Corps." Approved, April 22, 1938. [CHAPTER 168] AN ACT To extend the time for completing the construction of a bridge across the Saint Clair River at or near Port Huron, Michigan. Be it enacted by the Senate and House of Representatives of the United States of America in Congress assembled, That the time for completing the construction of a bridge across the Saint Clair River at or near Port Huron, Michigan, authorized to be built by the State of Michigan, by and through its State Bridge Commission, or

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