I don't think it is this, but the term OCS (C for Cadet) was also used by UK:
History. The Mons OCS was closed in 1972, and its responsibilities transferred to the Royal Military Academy Sandhurst, which was re-organised as an academy for student officers and officer cadets, including regulars, short servicemen, and Territorials.
The size of the letters indicates to me that it represents COS not OCS
Mike
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