Forward Operating Base 4

Forward Operating Base 4 (also known as FOB 4) is a former Military Assistance Command, Vietnam – Studies and Observations Group (MACV-SOG) Command and Control North base. It was near the Marble Mountains southeast of Da Nang, Vietnam. Seabees from NMCB 12 built sea huts on the base in 1968.^[1]

Forward Operating Base 4
Site information
Type	Army
Condition	abandoned
Location
Forward Operating Base 4
Coordinates	16.007°N 108.262°E / 16.007; 108.262 (Forward Operating Base 4)
Site history
Built	1967
In use	1967-72
Battles/wars	Vietnam War
Garrison information
Occupants	Military Assistance Command, Vietnam – Studies and Observations Group

History

The base was located immediately north of the Marble Mountains and south of Marble Mountain Air Facility.^[2]

On the night of 22–23 August 1968, as part of their Phase III Offensive, a company from the Viet Cong (VC) R20 Battalion and a sapper platoon infiltrated the base, killing 17 Special Forces soldiers (their largest one-day loss of the war) and wounding another 125 allied soldiers. Thirty-two VC were killed.^[3]

Current use

The base is abandoned and the area now consists of sand dunes with some commercial and residential development.