Mike Brown, the Unit Historian for the 213th Assault Support Helicopter Company sent us some historical photos of Chinooks with water buckets fighting a massive structure fire in Vietnam. Taken January 20, 1971, the photos were in a 213th ASHC Alumni Association Photo Album maintained by Don Skipper. The file names for a few of the photos mention Saigon.
This ties in with information from Bambi Bucket about how a version of a helicopter water bucket was fabricated by the 213th ASHC in Vietnam in 1968 by then 33-year old Lieutenant Colonel Glenn Carr and others in the 213th in Phu Loi, about 15 miles north of Saigon.
A gallery of 16 photos of the Chinooks operating with water buckets in Vietnam is below the jump: