PULLMAN, Wash., Nov. 9 -- Washington State University issued the following news release:

For more than an hour in the dark of night, veterinarian Dr.Neill Johnson, armed with only a .45-caliber pistol, was holed up alone just inside the entrance to an empty bunker as some 500 Vietnamese troops forced their way onto the small U.S. helicopter gunship base.

It was May3,1970, at Landing Zone Betty, a U.S. military base in SouthVietnam. Guided by local VietCong rebels, the attackers launched more than 120 mortar rounds and countless rockets, ambushed the base's small reserve force, and set fire to all its gunships.

It was Johnson's eleventh day in Vietnam and his first visit to the remote installation. With reserve forces wiped out, the Pullm...