Yep..Navions in Warbirds. L-17's were NA-145 and Ryan Navion A. If I ever sell the Skypig, I could see getting a Navion. Almost as fast as the O-2, with similar useful load and only one engine to feed and care for. I would probably even paint it up in Army colors, but unless it had a military pedigree, I would like to think I would resist the urge to park it with WB. Some of the ones there are genuine L-17s. There is one that has been there the past couple of years that is a genuine L17,with full records and meticulously restored. Most are not former military. Generally the pilots are honest enough to tell you if you ask. (Tip: L-17s did not have wingtip tanks. Not saying than someone may not have an STC to add them on later, but...) On the other hand, if we didn't have the (non-L-17) Navions there, the Liaison line would be much less dense than it is.
Flying around in circles. More exciting than you might think. Dissimilar aircraft at the same altitude with about 1000' nose to tail (that's my story and I am sticking to it), 200' separation between stacks, and very tight maneuver box. Recovery is even more exciting. Spend more time taxiing and holding on the ground than in the air.
Year before last they let me do a "rocket run" with pyro on the ground. That was fun.:-D