Allen began life in awe of the Jedi. He heard stories of their bravery during the clone wars, and would spend many hours as a child dreaming of becoming one. He studied their philosophies, and tried the best he could to adhere to their teachings on his own, which wasn't easy, considering that he grew up in a gambling asteroid colony called "Old Vegas" in the Outer Rim, and various criminal activity was taking place everywhere.
After order 66, his dream was crushed in one night, and he cursed the empire for killing the Jedi. His parents did their best to support him, but the galactic economy was crashing, and really the only option left for Allen was to use his skills at piloting spacecraft to try and pick up a job as a pilot.
He ran freight for a few years, and did his best to earn a living. When the Empire came, the small asteroid colony couldn't really do much to defend itself. The Empire needed the resources for their war machine.
Allen was away on a frieght run at the time, and didn't arrive until after the Empire had already come and gone. A small contingent of stormtroopers was left behind, but most of the colony was killed or captured. His parents were murdered by the Empire.
While in combat with the stormtroopers, a melee scuffle left an inverted V shaped scar on his right arm.
He ran away to Nar Shadaa to try and escape the Empire, and while he was there, he got a job as a local escort pilot. He carried the name "Vegas" as a callsign, in memorial to his destroyed home. He got a tattoo of a Spade symbol on his arm where the inverted V scar was at.
After several years of a rather pitiful lifestyle, taking crap jobs, he caught whispers of a militia force somewhere that was organizing to fight the Empire.
To him, it wasn't even a question. He spent all he had getting arrangements to join this group of fighters, since they needed pilots.
And thus, the legend of Allen "Vegas" McDowell was born.
Belief - The Republic
Psychological Warfare - 0
Male. Age 29. 5'10". Brown Hair. Green Eyes. Spade tattoo on his right arm. Goes by the nickname "Vegas."