2 REMAINING. Vanguard Tracking Ship. 1964–1999 - built as Type T2-SE-A2 tanker. The Vanguard was NASA's only seagoing station in the worldwide "Spaceflight Tracking and Data Network." Designed primarily for manned missions, Vanguard also supported various unmanned scientific space programs." Both are in very good condition. Each one is sold separately—rare postcards to find.