What does the bird emblem represent on this uniform?

We WW11 veterans refer to the emblem as the "RUPTERED DUCK". I wear it on my lapel on appropriate occasions 'Ed Gbson

it was issued to indicate that one had served in WWll

It was issued to indicate that one had served during WWll

Honorable Service Lapel Button
The Honorable Service Lapel Button, sometimes called the Honorable Service Lapel Pin, was awarded to United States military service members who were discharged under honorable conditions during World War II.[1] The award is sometimes colloquially called the Ruptured Duck.[2] Sculptor Anthony de Francisci designed the award.
The Department of Defense awarded the button between September 1939 and December 1946, and it was made of gilt brass, except during metal shortages during which it was made of gilt plastic. Service members who received the plastic version were later allowed to trade it in for the brass version.

It is still authorized to wear if you have an Honorable discharge.

This is a ruptured duck and signifies that this is a discharged veteran.

Haven't seen this until now.

lame duck

Ruptured duck :)
Ruptured Duck Patch -
Ruptured Duck Patch. More formally called the Honorable Service Lapel Patch, the "Ruptured Duck" was given to those members of the U.S. military who were honorably discharged during WWII. The insignia was worn on the right chest of the uniform and was meant to identify the soldiers who had done their duty.

It’s a Honorable discharge