Beresford

Lieutenant Beresford was the UNIT officer brought in to replace Yates when he was promoted to Captain. (PROSE: The Face of the Enemy)

Biography
Years later, when Beresford had been promoted to Major, he was in charge of UNIT while Brigadier Lethbridge-Stewart was away in Geneva. He was summoned by Sir Colin Thackeray to deal with the threat of the Krynoid which had been Arnold Keeler.

On the Fourth Doctor's advice, Beresford called in an RAF aerial attack to bomb the Chase Mansion, destroying the Krynoid. (TV: The Seeds of Doom)