After narrowly escaping the nationalization of Incom by the Empire, many former employees joined the Rebellion. They spent long hours maintaining X-wings and T-47s.
At same and related locations, adds 2 to your total battle destiny where your X-wing, T-47, T-16 and Z-95 is present and makes those vehicles and starships immune to attrition < 3 (< 5 if he is present with your maintenance droid).