Both of your parents were in the Alliance military. Your childhood was spent on ships and stations as they transferred from posting to posting. Following in your parents' footsteps, you enlisted at the age of eighteen.
One of your first missions was an expedition to investigate Akuze, a lush world on the outskirts of Alliance space that had suddenly dropped out of contact. Arriving on the surface, your patrol found the settlement intact, but there were no survivors.
At nightfall, the thresher maws struck - mindless abominations of teeth and tentacles that rose from beneath the earth. Constant gunfire couldn't drown out the shrieks of your fellow soldiers as they were dragged down to a gruesome death.
Fifty marines died on Akuze. You were the only one to make it back to the landing zone alive. A monument on the planet commemorates the massacre, a grim reminder of the price humanity must pay as they spread throughout the stars.