It is possible you're thinking of:
* "The Fall of Saigon" (1989) - This is a documentary directed by Peter Reeves. It features archival footage and interviews with people who were involved in the fall of Saigon in 1975.
* "The Fall" (2006) - This is a movie about the Rwandan genocide, and while the title is similar, it doesn't directly relate to the fall of Saigon.
Please provide more context or details about the film you're looking for.