Born in a little town in central Spain, Carlos was stumbling around in different basic jobs before joining the Spanish Army. He was sent with his platoon as part of the NATO task force deployed to the former Yugoslavia after the war.
After some shady affairs in which he was involved, he deserted the army to join Captain Hallen's team.
His troubled past made it impossible for him to turn back to his old life. It made him the perfect soldier for Captain Hallen, as he knew that Carlos would follow him to the end of the world if necessary, not by choice, but because he hadnít an alternative.
He is an excellent pilot, and has an innate ability to drive any kind of vehicle. He's quite introverted too, and he doesn't like to establish bonds with the rest of the team.
On the other hand, he always does what he is told without complaint, as he seems completely resigned to the role he has to play in his life.