In 2259, Khan Noonien Singh acquired the transwarp equation from Section 31. He utilized the equation devised by Montgomery Scott on an unauthorized portable transwarp beaming device to flee from his attack on Starfleet Headquarters in San Francisco. The device had several markings including D-24 on a button, VLC 2315.DS on the casing and SCI-2308.961 - EXP63B next to a display screen.