I am trying to find information on the investigation of Sgt. Edward Carter?

There may be an Army IG Investigation pertaining to him. We suggest that you contact the Textual Reference Archives II Branch via archives2reference@nara.gov to see if they can locate any information about an investigation.

We also have custody of a large number of FBI case files here at the National Archives in College Park, MD. However, we do not have a name index to the case files. It is my understanding that you can file a Freedom of Information Act (FOIA) request with the FBI to have them search the name index and provide the case file number. The FBI FOIA website is https://www.fbi.gov/foia/. Once you have the case file number, you can e-mail the Textual Reference Archives II Branch at archives2reference@nara.gov, and we can check to see if we have the case file.

Sgt. Carter is one of the National Archives at St. Louis' Persons of Exceptional Prominence.

Instructions on how to order a copy of his official military personnel file can be found at that link.