The Diamondbacks
The 4th Wing paints their machines in various shades of grey. They usually decorate a few panels with scales inspired from a Terran Diamondback snake.
Canonized by Foxbat on 4/28/2006.
The 5th Alliance Air Wing transitioned to the Raven Alliance’s military after the Outworlds Alliance and Clan Snow Raven officially merged in 3083.
Other references:
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The insignia of the Diamondbacks is a coiled rattlesnake sitting atop a planet. Per FM:Periphery, page 96.