If he was a combat casualty ther eis a file on him at PERSCOM which is called an IDPF--Individual Deceased Personnel File (File 293).This may have more detailed information on when and where he was killed.
The 293 File is most assuredly NOT the equivalent of the 201 (Personnel) file.
The 293 file has exclusively to do with the soldiers death. The content of this file can be EXTREMELY GRAPHIC and was NEVER intended for release to next-of-kin. It is available. But one should be forewarned as to the content. It is for all practical purposes a Forensic file and will likely describe the extreme nature and extent of wounds. This description will likely be accompanied by a skeletal chart. If the casualty was killed as a result of a catestrophic injury, such as stepping on a land mine, or being hit by an artillery shell or as the result of an airplane crash, one must be aware that the nature of the report will reflect that. It is not for the faint of heart. Dental and other medical charts will also be a part of the file.
Other materials that may be included are correspondence between commands regarding identifying the casualty, disposition of remains for local burial, reports on disposition of his personal effects and correspondence with your family regarding the return of his remains to the US for burial.
Acquiring the IDPF for a loved one is part of the story of his service in combat, but it can be extremely traumatic and one should be aware of that before ordering it.