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In page AGM-65 Maverick:

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Another major development was the AGM-65D, which employed an imaging infrared (IIR) seeker. By imaging on radiated heat, the IIR is all-weather operable as well as showing improved performance in acquiring and tracking the hot engines, such as in tanks and trucks, that were to be one of its major missions.[6] The seekerhead mechanically scanned the scene over a nitrogen-cooled 4-by-4 pixel array using a series of mirrored facets machined into the inner surface of the ring-shaped main gyroscope.[citation needed] The five-year development period of the AGM-65D started in 1977 and ended with the first delivery to the USAF in October 1983.[6] The version received initial operating capability in February 1986.[7]