The 1939-1945 Star

For a soldier to qualify for this award he was required to serve for six months in an operational command. This qualification applied with the exception of service in Dunkirk Norway and specified commando raids; in these cases the qualification period was one day. Airborne troops were required to participate in any airborne operation and complete two months service in an operational unit.

The 1939–1945 Star is a military campaign medal, instituted by the United Kingdom on 8 July 1943 for award to subjects of the British Commonwealth for service in the Second World War. Two clasps were instituted to be worn on the medal ribbon, the Battle of Britain Clasp and the Bomber Command Clasp.
Awarded by the Monarch of the United Kingdom and the Dominions of the British Commonwealth, and Emperor of India
Country United Kingdom
Type Military campaign medal
Eligibility All Ranks
Awarded for 180 days of operational service or 60 days of operational flying
Campaign(s) Second World War
Clasps BATTLE OF BRITAIN
BOMBER COMMAND
Statistics
Established 8 July 1943
First awarded 1943
Last awarded 22 December 2013
https://en.wikipedia.org/wiki/1939–1945_Star