The major American troop buildup between 1965 and 1968 required massive logistical resources. By 1968, almost 45 percent of all American military personnel in South Vietnam were support troops, and more than five million tons of goods were shipped into the country. Because of insufficient port facilities, American merchant ships in 1965 typically had a twenty-day waiting period to be unloaded. To eliminate that backlog, the United States constructed major deep-water ports at Cam Ranh Bay, Da Nang, Qui Nhon, and Newport, near Saigon. The port at Newport just outside Saigon relieved the congestion there after its construction was completed in 1967. Newport handled more than 150,000 tons of supplies each month. It was under the control of the army transportation corps.