The so-called "Ruptured Duck" is a device to be worn on the lapel to signify the wearer was honorably discharged after serving on active duty during World War II. It's officially known as the Honorable Discharge Lapel Insignia. A larger cloth version in gold (yellow) thread on a cloth diamond of the same color as the uniform (navy, kkaki, olive drab, forest green or white) was authorized for wear above the right breast pocket of the veteran's uniform. The term "Ruptured Duck" is, of course, slang. It derives from the illusion of the "duck" (actually an eagle) "rupturing' itself on the inside of the aura or "ring" bearing the national colors.