Snake is the callsign of a pilot who flies as Jo-Jo's wingman, when Jo-Jo is killed by Scar. Snake survives the engagement and reports Jo-Jo's death to Galactica.
He is assigned at short notice to replace Captain Thrace when she feels that she is in no condition to fly (Scar).
Re-imagined Series definition: a nickname used as a substitute for an aviator's given name in wireless communications and in conversation