What was the most successful regimental campaign of the Vietnam conflict?

The most successful regimental campaign of the Vietnam conflict is recognized as Operation Dewey Canyon. This operation, conducted from January to March 1969, involved a series of air and ground assaults against the North Vietnamese Army and Viet Cong forces in the A Shau Valley and surrounding areas. It is often cited as one of the most effective and innovative operations undertaken during the Vietnam War by the Marine Corps.

Operation Dewey Canyon is notable for its coordination of air and ground forces, its successful ambush tactics, and its impact on enemy supply lines. The operation showcased the tactical prowess of the Marine Corps and led to significant enemy casualties while achieving strategic objectives. Furthermore, it demonstrated the effectiveness of combined arms operations in a jungle environment, contributing to combat effectiveness in Vietnam.

The other operations listed did not occur during the Vietnam War or were not Marine Corps regimental campaigns. Operation Rolling Thunder was an extensive bombing campaign against North Vietnam but did not involve ground forces in the same capacity as a regimental operation. Likewise, Operation Enduring Freedom and Operation Desert Storm were operations related to conflicts in Afghanistan and Iraq, respectively, thus not connected to the Vietnam War timeframe or context.