Viet Nam, the ads make clear, is no Bali Ha'i. They emphasize that the job involves "long hours, difficult and possibly hazardous working conditions; minimum assignment: 18 months without dependents." Nonetheless, more than 25,000 Americans have volunteered in the past year to join an expanding U.S. team of civilians in South Viet Nam to push forward a peaceful social revolution amid the ravages of war.
"They seem to regard a tour of duty in Viet Nam as the most challenging, most demanding and most satisfying experience that anyone can find in the world today," says Sam Simpson, chief recruiter for...