Galen Tyrol (commonly referred to as The Chief) is a character on the television series Battlestar Galactica. Tyrol is responsible for the maintenance of the Vipers and Raptors aboard. Battlestar Galactica. After the events of the miniseries, he was the ship's highest-ranking non-commissioned officer at rank of Senior Chief Petty Officer. Galen Tyrol is played by Aaron Douglas. Character history At the start of the series, Tyrol is romantically involved with Lieutenant Sharon "Boomer" Valerii aboard Galactica, who is, unbeknownst to either Tyrol or herself, a Cylon, model Number Eight. Once Sharon's true nature is revealed when she attempts to assassinate Commander Adama, Tyrol is accused of being a Cylon and is thrown into the brig with Sharon. He claims he hates her and orders her to keep her distance, but when Sharon is shot and killed by Cally, he mourns her and reveals his true affection for her. Tyrol is found not to be a Cylon, for the time being, and resumes his job. Discovering the existence of Sharon "Athena" Agathon, who as another Number Eight Cylon who looks identical to Sharon Valerii, is pregnant and in love with Helo, confuses him -- especially with Sharon Valerii's death still haunting him. Galen's father was a Priest; his mother, an Oracle. He has served in the Colonial Fleet since he was 18 years old, working at various points on the Battlestars Pegasus, Columbia, Atlantia, and finally Galactica. It is suggested his experience extends beyond mechanical knowledge when he is stranded on the surface of Kobol - his actions there suggest a strong grasp of tactical and other military knowledge, as well as an extremely high level of competence overall. Adama holds him in very high esteem as Colonel Tigh acknowledges when he says "the old man has a soft spot" for him. Tyrol even modeled his own style of leadership on Adama's, and generally keeps a professional demeanor - although Tyrol tends to become overly protective, sometimes even irrational, when anyone under his command is injured or killed. Tyrol and Helo encounter trouble when Lieutenant Thorne, an officer on the Pegasus, attempts to rape Sharon Agathon while interrogating her. Rushing to her aid, Tyrol and Helo accidentally kill Thorne and are summarily sentenced to death by Admiral Helena Cain. After Cain's death, the two are eventually released from the brig by Pegasus' new commander, Jack Fisk, and all charges are