Major

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Major was a military rank.

Named Majors

Human

Norman Baker was Head of Security at the Wenley Moor nuclear research facility. (TV: Doctor Who and the Silurians)

Barrington (TV: The War Games), Daly (TV: Carnival of Monsters) and Popplewell (PROSE: Timewyrm: Exodus) were Majors of the British Army.

Walton (TV: Doctor Who and the Silurians), Alex Cosworth (TV: The Mind of Evil), Beresford (TV: The Seeds of Doom), Husak (TV: Battlefield) and Blake (TV: The Christmas Invasion) were UNIT Majors.

Branwell was a Major in command of the Henlow Downs missile site.  (TV: The Invasion)

Rex Butcher was a Major and a writer on an alternate Earth. (PROSE: Atom Bomb Blues)

Ferdinand was the head of security at Mariah Learman's palace.  (AUDIO: The Time of the Daleks)

Green was the Major in charge of security on the WOTAN project. (TV: The War Machines)

Alice Hunniford was an American Major. (AUDIO: Renaissance of the Daleks)

Alec Palmer was a Major turned Ghost-Hunter. (TV: Hide)

Shapp was an aide to the Marshal of Atrios. (TV: The Armageddon Factor)

Thessinger was a retired Major and a country landowner in England. (AUDIO: The First Sontarans)

Ian Warne was a Space Corps officer serving under General Nikolai Hermack.  (TV: The Space Pirates)

Salateen was an officer in General Chellak's troop on Androzani Minor.  (TV: The Caves of Androzani)

Other

Skar was a Sontaran Major. (GAME: The Doctor and the Dalek)

Tamasan was promoted to Major sometime after the Battle of Tenacity. (AUDIO: The Lords of Terror)