A decision was taken in 1930 to form an Egyptian Air Force and this was actually established in May 1932. The first aircraft wore green-painted wingtips marked with a white crescent and three stars. These three stars symbolised the main religions of Egypt; Islam, Christianity and Judaism. A 'wavy' version of the green and white Egyptian flag was carried on the fuselage, and the rudder was striped green, white and green. Later in 1932, a roundel form for wings and fuselage was adopted. This was green, white and green, with the crescent and three stars on the central green. The force became the Royal Egyptian Air Force in 1939, whereupon a white crown was marked on the outer green section of the roundel.
After the end of the Second World War, some British-supplied aircraft were used with the roundels painted over with green, and without the stars and crescent. With the fall of the monarchy in 1953 a return was made to the original 1932 markings but with a fin flash rather than rudder striping, and without the white crown.
In 1958 Egypt formed, with Syria and Yemen, the United Arab Republic. This would have a joint military command and a similar flag. This was red, for the sacrifice of revolution, over white, for the future, over black, for the years of oppression. The white part of the flag inspired a fin flash and roundel, which carried a number of green stars, in Egypt's case two. Even with the addition of Libya the federation was not politically viable. In 1972 Egypt dropped the two stars, and the national flag (and fin flash) bore a representation of the golden falcon of the Quraysh tribe. This was replaced in 1984 by the golden eagle of Saladin. On some combat aircraft the central black area has been increased in size relative to the rest of the roundel.
Estonia achieved independence from the Russian Empire after the revolution, in 1918. An air force was quickly formed which used the blue, black and white national colours, These were marked on the wings and occasionally on the fuselage as a triangle with the point facing downwards, The rudder was horizontally striped in these colours. In 1940 the country was absorbed Into the USSR and the Estonian Air Force ceased to exist.
Estonia officially regained its independence in 1990, and a return has been made to the original triangular insignia.