White enamel on gold badge is worn on the United Nations blue beret worn by UN Peacekeeping personnel. It belonged to navigator, Christian A. Tack
Christian A. Tack was a WWII navigator who flew 26 missions as a B-17 navigator stationed at Deopham Green, England.
Later in his USAF career, he was assigned to the 89th Airlift Wing at Andrews AFB, Maryland.