Theo Oberon
From Battlestar Wiki, the free, open content Battlestar Galactica encyclopedia and episode guide
Dash is the callsign of a Viper pilot assigned to Galactica.
Dash's Viper was seen in the hangar deck when Captain Lee Adama and Billy Keikeya were waiting for Laura Roslin to appear for her escape from Galactica and her incarceration (Resistance).
Dash was killed sometime prior to the destruction of the ace Cylon Raider nicknamed "Scar". He is mentioned by Captain Kara Thrace during her dedication to the fallen Viper pilots (Scar).