USA-184, also known as NRO Launch 22 or NROL-22, is an American signals intelligence satellite, operated by the National Reconnaissance Office.

Launched in 2006, it has been identified as the first in a new series of satellites which are replacing the earlier Trumpet spacecraft.

[2] USA-184 was launched by Boeing, using a Delta IV carrier rocket flying in the Medium+(4,2) configuration.

The rocket was the first Delta IV to launch from Vandenberg Air Force Base, flying from Space Launch Complex 6,[3] a launch pad originally constructed as part of abandoned plans for crewed launches from Vandenberg, originally using Titan rockets, and later Space Shuttles.

[1] In addition to its SIGINT payload, USA-184 also carries two secondary instruments; the SBIRS-HEO-1 missile detection payload as part of the Space-Based Infrared System programme, and NASA's TWINS-1 or TWINS-A magnetospheric science instrument as part of the TWINS programme.