Imagen:German paratroopers jumping From Ju 52s over Crete.jpg

This is because either:

1. It is a photograph created by the United Kingdom Government prior to 1956; or
2. It is an engraving created by the United Kingdom Government and commercially published prior to 1956; or
3. It is an artistic work other than a photograph or engraving which was created by the United Kingdom Government prior to 1956.

See Copyright, Crown copyright artistic works and HMSO Email Reply.