It is still used in the UK.
The UK civil Aviation Authority still recogizes military amber or white instrument rating to cover the Instrument Meteorological Conditions Rating. Rating and category of pilots noted. In case of fighter pilots the instruments ratings are White, Green and Master green. In case of transport and Helicopters flying category is classified into D-White, C-White, C-Green, B-Green and A-Master Green. Instructor category classified into C, B, A2 and A1.