Father of Cameron Mitchell. A test pilot in the 1960s, Mitchell lost his legs after a plane accident. Not giving in to defeat, he refused to allow his son to see him destroyed by the accident, and eventually he walked again.
When Cameron accidentally killed a convoy of innocent refugees in an F-16 mission his father assured him that he had to move forward, and that Cam was stronger than he had ever realized.
Frank's wife is Wendy, Cam's mother.
Collateral Damage - While in the Galaran's memory booth, Colonel Mitchell remembers his father and the impact he has had on his life.
Bounty - Frank and Wendy welcome Cameron and his "date" Vala home, and gets a earful from Vala about their supposed physical romance.