[member="Evard L'Rik"] | [member="Jason Arkada"]
Note that there is always a story behind the callsign, and the callsign is never decided on by the pilot himself... usually, it's something your squadmates end up pinning on you...
...and usually these stories are some source of hilarity or embarrassment. On the odd occasion, they speak to deed or skill or are derived from your name. So there had better be a good story behind your callsign, or the squadron will find a good one for you.
I might tell you the story of mine, sometime. Maybe.