NASA Brand Guidelines
This image, filename nasa-wormbus appears somewhat without context in NASA's current online brand guidelines, along with a description of how the logotype (known as Worm) should be used:
The NASA Logotype (Worm), designed by Richard Danne and Bruce Blackburn in 1975, was NASA’s official logo between 1976-1992. The Logotype can be used as a supplemental graphic to the NASA Insignia (Meatball) in when appropriate. The NASA Logotype should never appear without the Insignia in appropriate proximity except on commercial merchandise.