Joker
From Battlestar Wiki, the free, open content Battlestar Galactica encyclopedia and episode guide
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Joker is the known call sign for at least two pilots on battlestar Galactica (Miniseries, "Act of Contrition").
A restored Viper Mark II had a nameplate for a Lieutenant Pete Mickey, who was likely a Viper pilot assigned to Galactica during the Cylon War (Miniseries).
Another Joker was on the pilot's roster for Galactica during "Act of Contrition".