Combined Action began in 1965. The Marines started it as a cost effective way to provide security for their rear areas. The program was a success. A degree of control was placed over the villages that contained CAPs. Marine leaders saw their troops working together with the PFs and providing an outward appearance of pacification. The Marines looked back in their history and saw that they had trained good armies in Latin America. They saw the VC infrastructure as the real threat to the GVN. Combined Action, in concert with other pacification programs, would use Marine tradition from the early 20th century to win the Vietnamese war.
The Popular Forces that worked with the Marines were being prepared to carry on the pacification war after the Marines left. The GVN, however, was not prepared to support the Popular Forces after the Marine's left. The needs of area security, and the activities of the large VC units, also meant that combat operations took priority over training the PFs. They would not be able to carry on the fight as effectively when the Marines left.
Combined Action worked at providing area security. It excelled at this. It did work at pacification and Vietnamization. Pacification could only occur if the population felt that the GVN was stronger and preferable than the VC. Successful Vietnamization of the war was the only way this shift of thought could happen. No matter how effective at combating the VC the CAPs were, the CAPs were still US run units and represented foreigners who would someday leave. Unless the GVN was able to survive without US troops, it would lose the war. Combined Action could have been a positive step towards preparing the GVN to survive alone, but the effort in that direction was not there. There is also evidence that with the GVN, all the effort in the world would not have worked.
Disregarding the political aspects of Vietnam, as a military answer to counterinsurgency, Combined Action was effective. Its use for area security could come in handy again. There is a good chance that in future, US forces could again be called on to support a friendly government against an insurgency. Combined Action, properly employed would achieve area security while providing training for the indigenous forces involved. It would have to be clear that the Combined Action units would be there for security only.
The establishment of government, law and order would be up to the host government, possibly with US economic assistance. Combined Action will not win a counterinsurgency war, but it would provide civil authorities time and protection to establish themselves. Combined Action, if implemented in the future, is a military concept. Being such it can only help fight, not win in revolutionary warfare.
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