TopGun is the username I use on all Fourms (Top-Gun if TopGun is taken). It stems from a PC Game (well I had it on the Amiga) called Wing Commander where I used it as my Call-Sign, which stems from the Movie Top Gun (funny thing about Wing Commander is that the character you play in Wing Commander I, later becomes Christopher Blair (In WC I and II you choose his Name and Call-Sign), whose's Call-Sign is Maverick
)
Since this is a BSG Fourm, I chose a BSG Avatar, the Classic Viper.
As for my Sig, O though Battlestar Medusa sounded cool