TITLE 46 - US CODE - SUBCHAPTER I - GENERAL

46 USC 55301 - Priority loading for coal

A vessel engaged in the coastwise transportation of coal produced in the United States, from a port in the United States to another port in the United States, shall be given priority in loading at any of those ports ahead of a waiting vessel engaged in the export transportation of coal produced in the United States. However, if the Secretary of Transportation finds that it is in the national interest, the Secretary may eliminate this priority loading at any port. The Secretary shall report to Congress within 30 days an action eliminating priority loading under this section.

46 USC 55302 - Transportation of United States Government personnel

(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.
(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.

46 USC 55303 - Motor vehicles owned by United States Government personnel

Notwithstanding any other law, privately-owned American shipping services may be used to transport motor vehicles owned by personnel of the United States Government whenever transportation of those vehicles at Government expense is otherwise authorized by law.

46 USC 55304 - Exports financed by the United States Government

It is the sense of Congress that any loans made by an instrumentality of the United States Government to foster the exporting of agricultural or other products shall provide that the products may be transported only on vessels of the United States unless, as to any or all of those products, the Secretary of Transportation, after investigation, certifies to the instrumentality that vessels of the United States are not available in sufficient number, in sufficient tonnage capacity, on necessary schedules, or at reasonable rates.

46 USC 55305 - Cargoes procured, furnished, or financed by the United States Government

(a) Definition.— 
In this section, the term privately-owned commercial vessel of the United States does not include a vessel that, after September 21, 1961, was built or rebuilt outside the United States or documented under the laws of a foreign country, until the vessel has been documented under the laws of the United States for at least 3 years.
(b) Minimum Tonnage.— 
When the United States Government procures, contracts for, or otherwise obtains for its own account, or furnishes to or for the account of a foreign country without provision for reimbursement, any equipment, materials, or commodities, within or without the United States, or advances funds or credits, or guarantees the convertibility of foreign currencies in connection with the furnishing of the equipment, materials, or commodities, the appropriate agencies shall take steps necessary and practicable to ensure that at least 50 percent of the gross tonnage of the equipment, materials, or commodities (computed separately for dry bulk carriers, dry cargo liners, and tankers) which may be transported on ocean vessels is transported on privately-owned commercial vessels of the United States, to the extent those vessels are available at fair and reasonable rates for commercial vessels of the United States, in a manner that will ensure a fair and reasonable participation of commercial vessels of the United States in those cargoes by geographic areas.
(c) Waivers.— 
The President, the Secretary of Defense, or Congress (by concurrent resolution or otherwise) may waive this section temporarily by
(1) declaring the existence of an emergency justifying a waiver; and
(2) notifying the appropriate agencies of the waiver.
(d) Programs of Other Agencies.— 
An agency having responsibility under this section shall administer its programs with respect to this section under regulations prescribed by the Secretary of Transportation. The Secretary shall review the administration of those programs and report annually to Congress on their administration.