(a) In General.—An officer or employee of the United States Government traveling by sea on official business overseas or to or from a territory or possession of the United States shall travel and transport personal effects on a vessel documented under the laws of the United Sates if such a vessel is available, unless the necessity of the mission requires the use of a foreign vessel.

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(b) Regulations.—The Administrator of General Services shall prescribe regulations under which agencies may not pay for or reimburse an officer or employee for travel or transportation expenses incurred on a foreign vessel in the absence of satisfactory proof of the necessity of using the vessel.