New York: Award Books, (1966). 16mo. Wraps. 156 p. A182 F. "A Killmaster Spy Chiller" 1st ed. Newman 7. Very good. 
Many of the novels in this series were written under the Carter pseudonym by Michael Avallone or Valerie Moolman. "Nick Carter, who first appeared in the 1964 novel 'Saigon,' is back in Vietnam again. He performs numerous feats of derring-do, including impersonating a Vietnamese peasant, capturing a renegade scientist in North Vietnam, and then returning in disguise to penetrate a secret installation there. What is interesting is the support he draws from Special Forces units. They have what amounts to a permanent installation not far from Hanoi. In this author's imagination, the Special Forces also has its own aircraft and pilots" - Newman.