Dear Mr. Johnson,
Thank you for posting your request on History Hub!
Information about your friend may be included in a ground accident report. The U.S. Army Combat Readiness/Safety Center (USACR/SAFETY CENTER) is the repository and release authority for Army safety accident reports prepared in accordance with Department of the Army Pamphlet 385-40, Army Accident Investigation and Reporting, and Army Regulation 385-10, the Army Safety Program. For access to Ground Accidents Reports from 1973 to the present, contact the U.S. Army Combat Readiness/Safety Center, ATTN: CSSC-SS (FOIA), 4905 5th Avenue, Fort Rucker, AL 36362-5363.
Reports and related papers concerning collateral damage investigations (AR 15-6) are retained for five years and then destroyed by the Army in accordance with regulatory guidance.
We hope this information is helpful. Best of luck with your research!