page_title: AN/SPG-55
hierarchical_section_title: AN/SPG-55
caption_attribution_description: English: U.S. Navy crew members take a break under the twin SPG-55B fire control radar systems aboard the guided missile destroyer USS Mahan (DDG-42), 21 August 1983. The ship's Mark 10 Mod 0 missile launcher is in the foreground. Note: This is not an NTU-upgraded AN/SPG-55B radar. The Mark 10 Mod 0 removed the missle downlink horn and moved the doppler receiver antenna to the other side.
context_page_description: The AN/SPG-55 was an American tracking / illumination radar for Terrier and RIM-67 Standard missiles. It was used for target tracking and surface-to-air missile guidance as part of the Mk 76 missile fire control system. It was controlled by a UNIVAC 1218 computer.
context_section_description: The AN/SPG-55 was an American tracking / illumination radar for Terrier and RIM-67 Standard missiles (SM-1ER/SM-2ER). It was used for target tracking and surface-to-air missile guidance as part of the Mk 76 missile fire control system.  It was controlled by a UNIVAC 1218 computer.
caption: The USS Mahan (DDG-42) underway in 1983 to test and evaluate the Terrier New Threat Upgrade (NTU) Combat System. Two AN/SPG-55B directors are above the Mark 10 Terrier/Standard missile launcher and the sailors.
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