Unknown Medal Ribbons


May 28 2015

Peter Aitkens is asking for help in identifying a set of Medal Ribbons

I wonder if you can help….  

Lt Col William Carlton Langton Creech
Served in the Assam Valley Horse (I think he was a corporal at the time)
Served in V Force - major
Commanded Tripura Rifles - Lt Col
Emigrated to Australia after WW11
These are his medal ribbons -

Burma Star, War Medal, UNKNOWN, Efficiency Medal
Can anyone help identifying what the Unknown medal is. 
 .If you can please advise Editorkoihai.com