PRISM – Operated by the NSA together with GCHQ and the ASD[55][56] XKeyscore – Operated by the NSA with contributions from the ASD and the GCSB[57] Tempora – Operated by GCHQ with contributions from the NSA[58][59] MUSCULAR – Operated by GCHQ and the NSA[60] STATEROOM – Operated by the ASD, CIA, CSE, GCHQ, and NSA[61]