Mel,
You, sir, are correct. I never paid enough attention, but only the upper kick steps on the left and right were painted red on early birds. I had always assumed that i just couldn't see the lower ones because of the weapons mounts, but I can't find a single example (even alpha model trainers) where the lower kick steps were red. Thanks for clearing that up. Also, as you mention they were later changed to black. Howver, I think you will find many were just overpainted OD with black stencils as well.
Ray
Andy,
It also seems that the 68th AHC had UH-1C's with yellow kick step markers for the bottom steps but with black ones for the upper steps well into 68. Heck that was the configuration on the bird you built so i guess you already know that. I assume this is the bird you build, you can see the light lower kick step markers and the black upper one.
Here's a high vis bird from 66-67 showing the full on high vis scheme with the red kick steps above the engine deck as Mel has mentioned. Also notice that all the kick step markers are yellow.
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