At the conclusion of World War II, the northwest staging area of Fort Lewis became a separation center and discharged its first soldiers in October 1945. Sometime in the early 1960s Interstate 5 was built through the fort separating the northwest corner of the fort, and creating "Northfort". With the departure of the 4th Infantry Division (United States) for Vietnam in 1966, Fort Lewis once again became a personnel transfer and training center. David H. Hackworth described his service commanding a training battalion at the Fort during the Vietnam War in his memoir "About Face". In 1972, the 9th Infantry Division (United States) was reactivated, and trained there until its deactivation in 1991.