Dan Clayton is Lecturer in Human Geography at the University of St Andrews, Scotland. He is currently completing a book (co-authored with Gavin Bowd) entitled Impure and Worldly Geography: Pierre Gourou and Tropicality.
US helicopters and their crews arrived in Saigon on December 11 1961, ostensibly to take South Vietnamese troops deep into the jungle to wage what US advisors deemed to be a new kind of war: guerrilla warfare. Many see this event as the start of the Vietnam War.