Official seal of the <a href="https://en.wikipedia.org/wiki/North_American_Aerospace_Defense_Command" class="extiw" title="en:North American Aerospace Defense Command">North American Aerospace Defense Command</a>. Note that the oceans' colour is supposed to be "turquoise" <a rel="nofollow" class="external autonumber" href="http://www.norad.mil/about_us/heraldry.htm">[1]</a> but has consistently been rendered, in recent years, as frankly greenish. Older memorabilia uses a bluer colour, ranging up to light blue.
<a href="//commons.wikimedia.org/wiki/User:Antonu" title="User:Antonu">Antonu</a>
Self-made, based on logo from the NORAD website <a rel="nofollow" class="external autonumber" href="http://www.norad.mil/about_us.htm">[2]</a>