That's good news, and you're welcome, Mari. PFC Peterman's serial number is listed as 36846540. A couple of things she might want to try in search of info:
Contact the 17th Infantry Association. She might be able to find a member(s) who knew him, or at least those who shared his experience. Their web address is: http://www.17thinfantry.com/http://www.17thinfantry.com/
Request his Individual Deceased Personnel File (IDPF) from this resource:
US Total Army Personnel Command Att: TAPC-PAO (FOIA) 200 Stovall Street Alexandria, VA 2232-0404 (As well as giving them name, rank, serial number, unit, etc, be sure she cites the Freedom of Information Act in her request.)
I suggest this last resource with some trepidation. Mortuary and medical info contained in the IDPF's can be graphic. If she pursues it, she should be prepared for that possiblility.