Spies & Commandos: How America Lost the Secret War in North Vietnam.

Kenneth Conboy & Dale Andradé

Adapted from jacket:

"During the Vietnam war, the United States sought to undermine Hanoi's subversion of the Saigon regime by sending Vietnamese operatives behind enemy lines.

"A secret to most Americans, this covert operation was far from secret to Hanoi: all of the commandos were killed or captured, and many were turned by the Communists to report false information...."