Hi OP and prospective respondents.

First, a reminder of this sub's personal privacy rule: the person in question has recently died, and is not a public figure, so while it's fine to help out the OP with their inquiry in general, the OP's neighbour's privacy must be upheld here. Here's the rule:

Certain questions can lead to privacy concerns, and with this in mind, there are specific inquiries that we prohibit where, in our estimation, possible privacy concerns override the historical value of the question. As such, we do not allow questions which pose possible privacy issues for living, or recently deceased, persons who are not in the public eye. The cut-off for "recent" is 100 years, but even if a question does not meet the exact criteria above, we may remove at moderator discretion if we believe there nevertheless remains certain privacy concerns.

Next up, OP, you can get some tips for requesting military records from the sub's wiki here