Background
Stan grew up as an orphan when his parents were the first few to rebel against the Empire's rule over Sullust. Anyone else would be burning with revenge, but Stan was too young to understand the political tensions and turmoils to grasp why he grew up on the dust filled streets of a once beautiful metropolis. Without anyone to care for him, he took refuge with a local mining community that taught him how to maintain and manufacture machinery. As days became years and many of the mining community perished under the suboptimal mining conditions, he stuck his head deep into machinery to escape from it all.
While he ignored the outside world, the world didn't ignore him. Word of his talent with tinkering on machines reached the rebels who could use a helping hand. With a bit of mislead promise that Stan would be able to tinker with machines beyond his imagination, the temptation was too great and he leaped for the opportunity.
Only after did he realize that...he would have to put his life on the constantly and work with only military scraps that the Rebel force can muster. He adapted and became quite adapted to the military life, but will still grumble about getting tricked into this profession.
Motivation
Expertise: Stan simply wants to see machinery and technology he has never seen before in his hometown and know them inside out.