This is the main theme of the central character in the Dark Forces saga, Kyle Katarn. Known as a mercenary-for-hire, Kyle is hired by the Rebel Alliance to track down the plans to the Death Star, starting a series of missions that winds up pitting him against the best troops the Empire can throw at him.
I tried to be as faithful to the original composition as I could. There are a few changes, and I had to simplify it a bit in order to keep it from being turned into a duet.
Here is the original track:
I hope you enjoy it!