DFARS 204.2102

(a) Prohibited equipment, systems, or services . In addition to the prohibition at FAR 4.2102(a), unless the covered defense telecommunications equipment or services are subject to a waiver described in 204.2104 , the contracting officer shall not procure or obtain, or extend or renew a contract (e.g., exercise an option) to procure or obtain, any equipment, system, or service to carry out covered missions that uses covered defense telecommunications equipment or services as a substantial or essential component of any system, or as critical technology as part of any system.

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