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In page FIM-92 Stinger:

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The replacement FIM-92C began development in 1984, and production began in 1987. The first examples were delivered to frontline units in 1989. C-type missiles were fitted with a reprogrammable microprocessor, allowing for incremental firmware updates. Later missiles designated D received improvements to improve their ability to defeat countermeasures, and later upgrades to the D were designated G.[citation needed]