Believe it or not... V.A.T.S. is a retronym; Bethesda recycled the name of a map location in Fallout's Mariposa military base. Spoiler: The Vats *Notice Frame #1 of that video shows a Fallout 1 supermutant very close up, in profile. It always bothered me that Bethesda's engine was totally capable of running the entire game realtime with the art style of the Fallout 1 rendered cutscenes... but they didn't do it. They assigned meaning for each letter; Vault-Tec Assisted Targeting System. It does not exist in Fallout 1 & 2 as a Vault-Tec product, or as a tangible object at all. It is simply the UI for an aimed shot; and depending on character Traits, it's not even an option for all characters to have it. Yeah. You might like this: Spoiler (Skip a bit, to the 1 minute mark.) This detail was lost in Fallout 2 IIRC. I hope you visited the coast in Fallout 1; special map with the Ocean on it.