Are the US Navy's floating aircraft carriers of the 1930's "Warbirds"???
Last Monday at the Smithsonian Udvar-Hazy Center was the USS Akron's (ZRS-4) F9C Sparrowhawk:
Why do you think they choose this insignia?
...and in 1932
BTW: If you haven't made a visit to the Udvar-Hazy Center you're really missing out!!!