In British Airborne school, trainees must pass a training evolution called milling

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A square milling ring is formed by the seated trainee group, while an officer and two non-commissioned officers observe as judges from a raised platform.[1] Trainees are paired by weight and issued with head-guards, gumshields and 18oz boxing gloves.[1]

Each pair are told to punch each other’s faces as furiously as possible for one minute: "You must aim to dominate your opponent with straight punches to the head."[1]

Unlike boxing, it is forbidden: to pause in attacking the opponent; to aim at any part of the opponent other than the head; or to evade or block the opponent’s punches. The guidance notes state: "No ducking, parrying or other boxing defence moves are allowed."[1] The clock is paused if a trainee is knocked down or if his nose is broken; any blood is wiped away by staff and the bout resumes.[1]

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