Dillon was a member of the United States Colonial Marine Corps. He was part of the battalion stationed at Charon Base, there to provide security for the research facility and its staff. Dillon was one of the few Marines deployed to Charon still alive at the time a devastating Xenomorph outbreak was unleashed upon the facility, and he subsequently battled to evacuate as many civilians as possible from the complex.
- Dillon's statement "Oh, man! I got signals, I got readings all over!" is a reference the same quote spoken by William Hudson in Aliens.