Here's a link to a 'Stars & Stripes' archive article on Sen. Goldwater's trip in 1969 to Saigon regarding MARS stations.
http://www.stripes.com/blogs/archive-photo-of-the-day/archive-photo-of-the-day-1.9717
http://www.stripes.com/blogs/archive-photo-of-the-day/archive-photo-of-the-day-1.9717