[Code of Federal Regulations] [Title 41, Volume 4] [Revised as of July 1, 2004] From the U.S. Government Printing Office via GPO Access [CITE: 41CFR301-50.4] [Page 59] TITLE 41--PUBLIC CONTRACTS AND PROPERTY MANAGEMENT CHAPTER 301--TEMPORARY DUTY (TDY) TRAVEL ALLOWANCES PART 301-50_ARRANGING FOR TRAVEL SERVICES--Table of Contents Sec. 301-50.4 May I be granted an exception to the required use of the eTravel Service? Your agency head or designee(s) may grant case-by-case exceptions to the use of eTS when it-- (a) Causes an unreasonable burden on your agency mission accomplishment(s) (e.g., emergency travel (and eTS is not accessible), invitational travel, necessity of disability accommodations or special needs (in accordance with part 301-13 of this chapter)); (b) Compromises a national security interest; or (c) May endanger the life of the traveler (e.g., an individual traveling under the Federal witness protection program, or threatened law enforcement/investigative personnel traveling in accordance with part 301-31 of this chapter).