Fairly common, and long-standing, in the U.S.A.S./U.S.A.A.C., Sir, deriving from affection for American Indian motifs. A bit off-topic, perhaps, but here is a picture of a Boeing P-12 of the 55th Pursuit Squadron in the early nineteen-thirties, displaying the squadron badge:

You will not, by the way, find this symbol referenced on the squadron's history page nowadays, though there is plenty of period photographic evidence of it. It was Lemon Yellow on a True Blue field, with an outline in the former color.
And yes, I did a model of it....
