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Instituted on 3rd June 1918.
Awarded to other ranks of the Royal Air Force for an act or acts of valour, courage or devotion to duty while flying on active operations against the enemy. Later it was available to the equivalent ranks in the Army and Royal Navy for acts of valour in the air.
Recipients of the medal are entitled to use the letters D.F.M. after their name. A subsequent award receives a silver bar with an eagle in the centre of it.
It is equivalent to the Distinguished Service Medal (D.S.M.) for acts of valour at sea, the Military Medal (M.M.) for acts of valour on land and the Air Force Medal (A.F.M.).
The medal was designed by the medallist E Carter Preston.
Source: http://www.greatwar.co.uk/medals/ww1-gallantry-awards.htm#DFM
Please link the profiles of recipients on GENi to this project.