But one unit truly exemplifies these traditions through its actions and its enduring nickname: the Walking Dead.
Through nearly four years of combat in Vietnam, the 1st Battalion, 9th Marines earned its place in Marine Corps history.
The 1st Battalion first arrived in Vietnam in June 1965 as part of the troop increase and escalation that year as U.S. forces took over most combat operations from the South Vietnamese. By August they were involved in offensive combat operations as part of Operation Blastout — a search and clear mission.
More missions continued throughout 1965 and into 1966. In their first year in Vietnam the Marines of 1/9 would conduct hundreds of company-sized or larger missions. The Marines of the 1st battalion, as part of a greater effort by the 9th Marine Regiment, also developed the SPARROW HAWK concept. This was essentially a heliborne quick reaction force that could be called in to help win a fight in which Marines on patrol had found themselves. The 1st Battalion, 9th Marines then rotated out of Vietnam for a few brief months beginning in October 1966.
When the unit returned in December 1966 the operations tempo greatly increased. The 1st battalion Marines started 1967 with the anti-climactic Operation Deckhouse V. From there operations picked up in the 9th Marines tactical area of responsibility. This area just south of the Demilitarized Zone became known as "Leatherneck Square" for the high number of Marine casualties. The Marines there swore the wind, rather than blowing, made a sucking sound. It was in this area that the 1st Battalion 9th Marines became the legendary Walking Dead.
The battalion participated in three phases of Operation Prairie within Leatherneck Square. Casualties were heavy as the Marines conducted search-and-destroy missions. In less than a month through mid-1967, Marine casualties during Prairie IV were 167 killed, and over 1,200 wounded.
In July, 1/9 participated in Operation Buffalo, a clearing mission up Highway 561. On the first day of the operation, July 2, the Marines of A and B companies encountered strong NVA resistance. The fighting was bitter. The NVA used flamethrowers to burn the vegetation and force the Marines into the open. An NVA artillery round wiped out the entire company headquarters for B company.
Soon the commander of 1/9 sent in C and D companies to relieve the battered Marines. With significant support they were finally able to force the NVA to break contact. The battalion suffered 84 Marines killed and 190 wounded. The next day only 27 Marines from B company and 90 from A company were fit for duty.
A combination of the remnants of Companies A and C several days later was able to get some payback on the NVA, inflicting 154 enemy killed. By the middle of July Operation Buffalo came to an end. Almost immediately the men of the 9th Marines were back in action as part of Operation Kingfisher in the Western portion of Leatherneck Square. This operation drug on until the end of October 1967. The sporadic but intense combat saw another 340 Marines killed and over 1,400 wounded in Leatherneck Square.
January 1968 found the battalion reinforcing the infamous Khe Sanh Combat Base just south of the Demilitarized Zone and west of Leatherneck Square. The Marines at Khe Sanh not only held the base but also fought in the hills surrounding it. Just over a week before the Tet Offensive began on January 30, 1968, the North Vietnamese began laying siege to Khe Sanh. Some 6,000 Marines, including 1/9, would endure daily shelling and close-combat for 77 days before being relieved. In all, 205 Americans were killed and over 1,600 wounded defending Khe Sanh. A further 200 Marines died in the bloody fighting in the hills surrounding Khe Sanh.
The lifting of the siege was hardly the end for the Walking Dead though. Immediately upon relief of duty from the defense of Khe Sanh they began Operation Scotland II to clear the area nearby. Following the conclusion of Scotland II, the Marines of 1/9 returned to the Con Thien area and took part in Operation Kentucky. This action would last until near the end of 1968.
In early 1969, the 1st battalion, as part of the larger 9th Marine Regiment, launched Operation Dewey Canyon, the last major Marine Corps operation in Vietnam. During this time the Marines swept through the NVA controlled A Shau valley and other areas near the DMZ. In a heroic action on February 22, 1968, then-Lt. Wesley Fox earned the Medal of Honor. The Marines suffered over 1,000 casualties during the operation. The entire regiment was awarded a Presidential Unit Citation for their extraordinary heroism during Operation Dewey Canyon.
The Walking Dead — along with the rest of the 9th Marines — redeployed from Vietnam in the summer of 1969 to Okinawa.
The name "the Walking Dead" was originally used by Ho Chi Minh talking about the Marines in the A Shau valley. Later, after the 1st Battalion suffered extraordinarily high casualty rates, they used the term to describe themselves. Of a standard battalion strength of 800 Marines, the battalion had 747 killed in action with many times that number wounded. They also were in sustained combat operations for just short of four years. Both of these are Marine Corps records.
The unit was disbanded in mid-2000, reactivated for Operation Enduring Freedom and Operation Iraqi Freedom, then was disbanded again in 2015.