While most Marines think of the Vietnamese Marine Corps as the primary advisory experience during that conflict, Marines served with other programs. One of these is the subject of this study: Marine advisors with the Vietnamese Provincial Reconnaissance Units (PRUs). This narrative is a combination of experience, research, and reflection.While other journalistic or academic accounts have been published, this is a narrative of participants. Many historians consider the two most effective counterinsurgency organizations employed during the VietnamWar to have been the PRU and USMC Combined Action Platoons (CAP). The author believes that both of these programs have applicability in any counterinsurgency where U.S. forces are called upon to assist a host government. (Originally published by the History Division, USMC)