60 STAT.] 79TH CONG., 2D SESS.-CH. 756--AUG. 2 ,1946 859 under competent orders without troops, including travel from home to first station in connection with their appointment or call to active duty and from last station to home in connection with relief from active duty or discharge not the result of their own misconduct, shall receive a mileage allowance at the rate of 8 cents per mile, distance to be computed by the shortest usually traveled route and existing laws providing for the issue of transportation requests to officers of the Army traveling under competent orders, and for deduction to be made from mileage accounts when transportation is furnished by the United States, are hereby made applicable to all the services mentioned in the title of this Act: Provided. That Expenses in lieu of the head of the executive department concerned may, in his discre- mileage. tion, direct that, in lieu of mileage, actual and necessary expenses shall be allowed to officers traveling on official business and away from their designated posts of duty, without regard to the length of time away from such posts. Actual expenses only shall be paid Payment of actual for travel under order in Alaska and outside the limits of the United expenses. States in North America." SEC. 203. The second paragraph of section 12 of the Pay Readjust- 56 Stat. 365. 37 U. S.C., Supp. ment Act of 1942 is amended to read as follows: v, § 112. "Unless otherwise expressly provided by law no officer of the fPayments in excess of subsistence ex- services mentioned in the title of this Act shall be allowed or paid penses. any sum in excess of expenses actually incurred for subsistence while traveling on duty away from his designated post of duty, nor any sum for such expenses actually incurred in excess of $8 per day. The lier diem rstesne heads of the executive departments concerned are authorized to pre- scribe per diem rates of allowance, not exceeding $7, in lieu of sub- sistence to officers traveling on official business and away from their designated posts of duty, without regard to the length of time away from such posts. Officers, midshipmen and cadets of the Navy, Marine Corps, and Coast Guard when absent from a vessel or designated post of duty while assigned to shore patrol duty may be paid their actual expenses, and naval personnel on duty with or under training for the Naval Air Transport Service and away from their permanent sta- tions may be paid their actual expenses, or per diem in lieu thereof, at rates not exceeding those prescribed for naval officers in a travel status, without in either case the issuance of orders for specific travel: Pro- vided, That for travel by air under competent orders on duty without Travel by air. troops, under regulations to be prescribed respectively by the heads of the departments concerned, members (including officers, warrant officers, contract surgeons, enlisted men, aviation cadets, and members of the Nurse Corps) of the services mentioned in the title of this Act, and of the legally constituted Reserves of said services while on active duty, and of the National Guard while in Federal service, or while participating in exercises, or performing duties under sections 92, 94, 97, or 99 of the National Defense Act, shall, in lieu of mileage 3 StaC.206 27. or other travel allowances, be allowed and paid their actual and neces- 14 -146. sary traveling expenses not to exceed $8 per day, or, in lieu of subsistence, per diem allowances at rates not to exceed $7 per day. Without regard to the monetary limitations in this Act, and in accord- eDu It Alaska ance with regulations prescribed by the President, the heads of the departments concerned may authorize the payment to members of the services mentioned in the title of this Act on duty outside continental United States or in Alaska, whether or not in a travel status, of actual and necessary expenses or per diem in lieu thereof, considering all elements of cost of living, including cost of quarters, subsistence, and other necessary incidental expenses.