03-26-2018, 12:35 AM
The insignia would depend upon the 505th's assignment. IF it has attached to Army or Corps or to another level of authority. Some AAA units had a rondel with AA inside it. The AAA units surrounding Antwerp had their own. I would start with the HQ to which the 505th reported.. Do you have any photos of indiviudals in the 505th? Can you see what they were wearing?
The 978th Engineers, wore the shoulder insignia of the Ninth Army even though they had been assigned (kind of loaned out) to the XIXthe Corps (which had its own insignia)