The mission Colonel John J. Padley received when he assumed command on May 13 was essentially a holding action with an aggressive posture. His Marines were to occupy key terrain, patrol aggressively to locate and engage PAVN forces, secure the base and its outlying positions, and support the Special Forces camp at Lang Vei with artillery. The 1st Battalion, 26th Marines, under Lieutenant Colonel Donald E. Newton, spread across the highlands: one company on Hill 881 South, one on Hill 861, a security detachment at the radio relay site on Hill 950, and the rest of the battalion at the base itself.

Patrols went out continuously within a 4,000-meter radius of each outpost. Company A, 3rd Reconnaissance Battalion pushed further, inserting teams deep into the surrounding terrain for long-range surveillance. Intelligence reports indicated that all three regiments of the PAVN 325C Division remained in the tri-border region where Vietnam, Laos, and the DMZ converged. Throughout May, contact was light. The hills were quiet in the way that mountains before a storm are quiet.

At 01:01 on June 6, 25 mortar rounds and rockets hit Khe Sanh Combat Base. An hour later, Hill 950 came under assault from the west and northeast. PAVN soldiers penetrated the perimeter before the defending Marines drove them back, leaving ten PAVN dead and seven weapons on the ground. Six Marines were killed, two wounded. It was the beginning of a month that would be far worse.

On the afternoon of June 7, a patrol from Company B ran into mortars and then an assault by roughly 40 PAVN soldiers about two kilometers west of Hill 881 South. Reinforcements arrived by helicopter. When the PAVN withdrew at 16:30, 66 North Vietnamese soldiers were dead. Eighteen Marines had been killed and 28 wounded — in a single afternoon's fighting. Two days later, a UH-1E gunship was shot down in the same area; the pilot was killed, the copilot wounded, the helicopter destroyed. The 3rd Battalion, 26th Marines returned to Khe Sanh on June 13, doubling the force available for operations.

The worst single day came on the morning of June 27. Fifty mortar rounds struck the base before dawn, killing nine Marines and wounding 125. A follow-up rocket attack killed one more and wounded 14. Then, at noon, Company I walked into two PAVN companies while searching for a suspected mortar position west of the base. Company L landed by helicopter to reinforce them. By evening the PAVN had withdrawn again, leaving 35 dead on the ground.

Operation Crockett concluded on July 16, 1967. The official tally: 111 PAVN killed, one captured. Marine losses: 34 killed. Behind those figures lay the accumulated weight of two months of patrols through dense jungle, of nights in bunkers listening to the approaches, of the particular exhaustion of a war where the terrain itself was an adversary.

The strategic conclusion was unavoidable. Despite the Hill Fights, despite two months of aggressive patrolling, despite the losses they had absorbed, PAVN forces had not withdrawn from the Khe Sanh area. They tested the defenses, probed the hilltop outposts, accepted casualties, and stayed. The 26th Marine Regiment transitioned directly into Operation Ardmore, a security operation that would run through October — because there was nothing else to do. The PAVN were not leaving, and so neither could the Marines.

In retrospect, Operation Crockett reads as a prelude. The same hills — 881 South, 861, 950 — that Marines fought to hold through the summer of 1967 would become critical terrain again when the full siege of Khe Sanh opened in January 1968. The same PAVN divisions that probed the defenses during Crockett were part of the force that surrounded the base six months later. The same Route 9 corridor that supply convoys and patrols used in 1967 became a contested resupply lifeline during the 77-day siege.

For the Marines who served through Operation Crockett, the summer's fighting was its own complete thing — its own dead, its own wounds, its own exhaustion. But looking at the map, at the hills and the base and the jungle between them, it is hard not to see it as a rehearsal that both sides were conducting, learning the terrain and each other's capabilities, preparing for something larger that neither side could quite see yet.