Estonian military Aircraft Insignia Type 1. Used on wings.
<a href="//commons.wikimedia.org/wiki/User:Kwasura" title="User:Kwasura">Kwasura</a>
2013-12-30
<span class="int-own-work" lang="en">Own work</span> based on <span style="border:1px dotted #FC0;padding:0 4px"><a href="https://en.wikipedia.org/wiki/File:ESTFtr2.jpg" class="extiw" title="en:File:ESTFtr2.jpg">ESTFtr2.jpg</a></span>