British white army

Apparently, the British wanted to have an all-white army:

The British Army secretly restricted the number of recruits from ethnic minorities for 20 years, newly released official documents show.

From 1957 Army medical officers were instructed to note all new recruits with "Asiatic or Negroid features".

The data were used to limit the number of "non-white" troops in the Army.

The secret system was uncovered after about 50,000 government files were made public on the first working day of the Freedom of Information Act.