14 C.F.R. § 1214.201 Definition.
Title 14 - Aeronautics and Space
For the purpose of this subpart, the term users means: (a) For all civil U.S. Government agencies who request Shuttle services from NASA, and (b) Foreign users who have made substantial investment in the STS program, i.e., European Space Agency (ESA), ESA member or observer nations participating in Spacelab development, and Canada, when conducting experimental science or experimental applications missions with no near-term commercial implications.
Title 14: Aeronautics and Space
PART 1214—SPACE FLIGHT
Subpart 1214.2—Reimbursement for Shuttle Services Provided to Civil U.S. Government Users and Foreign Users Who Have Made Substantial Investment in the STS Program
§ 1214.201 Definition.

