Aerial unicorn… The 359 Fighter Group is a 1940’s US Air Force unit that flew several operations in WWII in P-51 Mustang aircraft. “The Unicorns” were their conical name and had insignia patches to match!

Sauce: https://www.usmilitariaforum.com/forums/index.php?/topic/372637-359th-fighter-group-eighth-air-force-the-unicorns-caeda-forte/
and
https://en.m.wikipedia.org/wiki/123rd_Operations_Group