In the late 1980s and early 1990s, NASA formally studied a cargo-only vehicle, Shuttle-C, that would have supplemented the crewed Space Shuttle in orbiting payloads.
Pada akhir 1980-an dan awal 1990-an, NASA resmi diteliti kendaraan kargo saja, Shuttle-C, yang akan dilengkapi Space Shuttle berawak dalam mengorbit muatan.