Vault-Tec originated from the Fallout series of role-playing video games, where they are prominently featured or referenced in every major installment. They are the notorious creators of the underground fallout shelters (known as "Vaults") that dot the United States of America. They are also referenced by the "Vaultguy" collectible item, which has the same blue-and-yellow color scheme of a Vault-Tec jumpsuit.