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Dear Ms. Knez,
Thank you for posting your request on History Hub!
We searched the National Archives Catalog and located the series Missing Aircrew Reports (MACRs), 1943 - 1945 in the Records of the Office of the Quartermaster General (Record Group 92). According to the MACR index, MACR No. 14229 reported the crew of the 776th Bomb Squadron, 464th Bomb Group (including John P. La Rue, David Earl Pleasant & Marvin Cropper) missing on 19 February 1945. It was first thought they landed in Pecs, Hungary but later it was determined that they were captured by part of the Ustachi Garrison and returned to duty on 15 May 1945.
We also searched a series titled Subject Files, 1942 - 1946 of the American POW Information Bureau in the Records of the Office of the Provost Marshal General (Record Group 389) and located a file unit titled Camp Reports: Croatia. The documents indicated that the Croatians turned the POWs over to the Germans in Zagreb without interrogation. No additional information was found.
We hope this is helpful. Best of luck with your research!