 After Univac had demonstrated the TRANSTEC computer to the United States Air Force, it was awarded a contract to build a transistorized ground guidance (Athena) ICBM defense computer.In 1957, Remington Rand St. Paul Univac-division of Sperry Rand Corporation, had built a transistorized ground guidance Athena computer, for the United States Air Force's Titan 1 intercontinental ballistic missile defense system (ICBM).It was designed by Univac's St. Paul engineer Seymour Cray, and used the Philco's high-frequency surface-barrier transistors in its computer's circuitry design.