The Vault-Tec Corporation is an unseen Earth-based organization in the 2016 reboot of the Doom series. Their logo appears on a door in the UAC facility on Mars, implying that they may have been involved in the construction of the complex.
Behind the scenes
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.