Given the USAF’s propensity for shooting its allies and own forces, painting “Don’t Shoot” in large letters on your aircraft isn’t as silly as it first seems. During the Vietnam War era, when precision systems such as GPS weren’t invented and other electronics such as IFF were unreliable, it was a very practical thing to do. Forward Air Control was, and still is, a high risk business.
Whilst the custom stickers might be the first thing that catch your eye on Henrik Jensen’s Cessna O-2 Skymaster, there’s other stuff to see too. Henrik has added some military stores under the wings and changed the windscreen from the trans-clear of his civil version, to a toned-down trans-brown. Take a look at Henrik’s MOC on Flickr and then see Danny Glover flying the real thing in the highly fictionalised, BAT*21.