During the Command's first year in Vietnam, nearly 1.4 million tons of military cargo had been handled at the Saigon Port alone with an average of 100 ,ships each month.

Beginning 4 July 1966 the Command was assigned the further mission of handling U.S. Agency for International Development and Commercial Import Program cargo. Members of the Command are also serving as advisors to officials of the Republic of Vietnam who operate the commercial port of Saigon.

With the opening of Newport in August 1966, a recently constructed facility north of Saigon, some of the heavy burden has been taken off the port of Saigon. These newest docks in the Saigon area serve re-routed ships which formerly tied up much of Saigon Port's traffic, plus refining and expediting, handling of USAID/CIP cargo.

In July 1967 the U.S . Army Transportation Battalion Vung Tau/Delta (Provisional) was established to operate the U.S. Army Terminal Vung Tau/Delta and to command control the 5th Transportation Company (heavy boat), the 329th Transportation Company (heavy Boat) and the 1097th Transportation Company (Medium. Boat).

One of the Command's major achievements in 1966 followed the SS Baton Rouge Victory disaster in August. The Victims, of the underwater mine explosion which blew up the vessel, were brought to hospitals by boats assigned to this Command our tugs helped beach the stricken ship, thus keeping the vital ship channel in the Saigon River, open. Personnel and equipment of the Command managed to salvage a major portion of the cargo aboard the ship which was destined £or Saigon and transported it upriver on barges to its destination.

The 4th Transportation Command consists of three transportation terminal service battalions, the 11th Transportation Battalion and 71st Transportation Battalion, the U.S. Army Transportation Battalion Vung Tau/Delta (Provisional), and the 125th (Terminal A) Transportation Command