This is the fourth volume in a planned 10-volume operational and chronological series covering the Marine Corps' participation in the Vietnam War. This volume concentrates on the ground was in I Corps and III MAF's perspective of the Vietnam War as an entity. It also covers the Marine Corps participation in the advisory effort, the operations of the two Special Landing Forces of the U. S. Navy's Seventh Fleet, and the services of Marines with the staff of the U.S. Military Assistance Command, Vietnam. There are additional chapters on supporting arms and logistics, and a discussion of the Marine role in Vietnam in relation to the overall American effort.