Joker
From Battlestar Wiki, the free, open content Battlestar Galactica encyclopedia and episode guide
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".