Commemorative Cross of the 1916–1918 War exterior and 7 mm on the interior. In the center of the cross, there is a 13 mm circle. The external borders of the cross and the circle have 1.3 mm. Inside the circle, on the obverse, there is the royal cypher of King Ferdinand I of Romania (two "F"s facing away with a royal crown on top), while on the reverse there is inscribed "1916"|"1918" on the early models and "1916"|"1919" on later models, in two rows. The 30 mm ribbon alternates four equal bars of dark blue with three equal bars of green. Seventeen clasps were approved for
Distinguished Flying Medal awarded to commissioned officers and Warrant Officers, although the latter could also be awarded the DFM. The decoration ranked below the DFC in order of precedence, between the Military Medal and the Air Force Medal. Recipients of the Distinguished Flying Medal are entitled to use the post-nominal letters "DFM". Although announced in the London Gazette on 3 June 1918, the actual Royal Warrants were not published in the London Gazette until 5 December 1919. In 1979 eligibility for a number of British awards, including the DFM, was extended to permit posthumous awards. Until that time, only the Victoria Cross and