Black Ops 6, the 21st game in the Call of Duty series, has garnered excellent reviews and praise due to its well-planned story and engaging gameplay. Notably, one level, "Project Truth," features the USATA (United States Advanced Technology Administration), a department of the CIA that conducts research on advanced technologies, including MKUltra. USATA's comprehensive facility was established in 1962 and was used to investigate mind control techniques. However, due to a lack of funding in 1981, the facility was abandoned, and the research was halted. In 1991, the player returns to the abandoned facility and discovers four keycards that grant access to an elevator. The keycards are described as being high-tech and appeared to be pre-punched cards. However, the player notes that the actual cards may have been plain cards, as pre-punched cards did not exist at the time the game was set. VingCards, a pre-punched keycard company, was founded in 1975 and offers an affordable solution for electronic locks. In addition to the keycards, the player discovers other events and details, such as a cryptic message on the keycard that appears to be invisible. The player is left wondering about the true meaning behind the keycard and whether it holds a significant secret or if it is simply a hollow message.