Years ago, I was working on the set of an underarm deodorant commercial in New York City. I don’t recall how it came up, but during a conversation with one of the producers, he confided in me that while he was serving in Vietnam during an ambush situation in Da Nang, his platoon was forced to remain silent while a 30-foot diameter disk 20 yards away from them exploded up from the floor of the densely-forested jungle in which they were hiding and up into the sky, streaking away silently.
This TV commercial producer was not a UFO buff, he was just telling me about a bizarre experience he had in Vietnam. A lot of strange things happened in Vietnam. An abundance of UFO sightings was one of them, as documented in this short.