Here is some information I found. Plus a crew picture hope you recognize your relative.
Lt Rollie King Crew 100th BG, 351st BS:
Lt Rollie C. King Crew Back Row L to R: Robert G Mitchell, Francis Gordon, James Baker, Meyer Gitlin, & Archie Mathosian. Front Row L to R: John Spencer, Rollie King, Jack Williams & Ray Wilding.
Dear Val Burgess:
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If you have not done so already, we suggest requesting his military personnel file. Information about those records is below.
Official Military Personnel files (OMPF) are in the custody of NARA's National Personnel Records Center in St. Louis, MO. Below is a GSA Standard Form 180 which you should complete and mail to NARA's National Personnel Records Center, (Military Personnel Records), 1 Archives Drive, St. Louis, MO 63138-1002.
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The National Archives at College Park - Textual Reference (RDT2) has custody of the primary body of World War II unit records is held in RG 407, World War II Operations Reports (Entry NM-3 427). Military unit files among these records consist mostly of historical reports, after action reports, unit journals, and general orders. Their contact information is email@example.com. For these records, you would need to know the unit that Sgt Meyer Gitlin served with. We would also normally recommend the MACR report, but as noted in your inquiry that did assist you with your research.
We hope this is helpful. Best of luck with your research!
There are a few alternatives for additional information. KU Reports, shorten for Kampfflugzeuge USA Reports, were prepared in Luftgau (German administrative offices) referencing Allied downed aircraft over German-occupied Europe. These records are contained NARA Record Group (RG) 242. I think the reference is RG 242/1033/ ItemNo.12/Containers 1 - 202/Rows 71 - 74/Original German records, but I am not sure as this is a reference from several years ago.
A complete collection of the German reports does not exist due to many being destroyed at the end of the war.
Sometimes the KU report was included in the MACR but not always. Some have been translated from German but I don't think all have been. I don't know if a KU report exists for Gitlin and the Rollie King crew and plane. The KU reports are indexed by location and crash date. The NARA can verify if a KU report exists.
Another option is War Crimes Case number 12-2772 regarding the investigation into Gitlin's death. Index card records for this case are in Record Group 153: Records of the Office of the Judge Advocate General (Army), 1792 - 2010 Series: European Name Index to the Series "Case Files, 1944-1949", 1944 - 1949
Six witnesses are listed in the index cards, all are surviving crew members; and three victims are listed, Gitlin, Baker and Mitchell. The index cards are available online but the actual case and related testimonies are not online to my knowledge. The card below references a letter from Col. C. E. Straight. He was a Deputy Judge Advocate for War Crimes, JAGD. Gordon was a crew member.
Finally, an Individual Deceased Personnel File may exist. IDPFs are held at two locations, NARA-St. Louis and the Army Human Resources Command in Ft. Knox, KY. Fort Knox has the IDPFs for U.S. Army members killed during WWII. St. Louis holds the records for the Air Force. The Air Force became a separate branch of the military post WWII. It's confusing to me as to who has what so I include both contacts as the Army Air Corps was a part of the U.S. Army during WWII. IDPFs may be requested by sending an email to: USARMY.KNOX.HRC.MBX.FOIA@MAIL.MIL
The St. Louis contact info is:
Written request: National Archives at St. Louis, P.O. Box 37587, St. Louis, MO 63138
Provide the name, rank, serial number, unit, and death date of the soldier who was killed in action. I submitted my request as a FOIA request. I don't know if this is still needed as it has been more that 5 years since I requested an IDPF. I do recall waiting up to 10 months to receive an IDPF so be prepared to wait.