"One of the least known of paramilitary air forces must surely be that of
the Austrian Heimwehr Fliegerkorps during the 1920s and 1930s. Formed from earlier paramilitary flying groups, the Heimwehr Fliegerkorps operated a
selection of German, Austrian and British aircraft, and even participated during the Austrian Civil War of February
Its marking was: "The Heimwehr symbol appears on the rudder, and consists of
a White bird (Eagle) on a Green disc, superimposed on an Austrian flag with horizontal Red/White/Red stripes."
spotted by Dov Gutterman, 25 June 2004