Re: Military Ring Question
Well, that's obviously not a Ruptured Duck.
I'd say that it's probably the logo of the WW1 217th Aero Squadron.
I've searched Google and can find no reference to that squadron, but you might try the Air Force Historical Research Agency at:
Phone: (334) 953-2395 or DSN 493-2395 or
600 Chennault Circle, Bldg 1405
Maxwell AFB, AL 36112-6424