Kitty, you said your brother's name was John Quincy Adams Collins. I found this listing in the ABMC database. If it is him, I hope it will contain info useful to you in your search.
John Q. A. Collins Private First Class, U.S. Army Serial Number 34235394 50th Infantry Battalion, 6th Armored Division Entered the Service from: Louisiana Died: August 23, 1944 Buried at: Plot H Row 11 Grave 10 Brittany American Cemetery St. James, France Awards: Purple Heart