Who did I serve with?

Hi, I'm trying to learn if it would be possible to have access or to request a list or a record of people who served with you in any deployment you would have had in your career. Like roommates etc...that sort of thing. I'm asking this because I was recently talking with my dad and he was telling me all these stories about his deployments and how many dear close friends he's lost to time. We didn't have Facebook back in the day. When I say back in the days I mean the 1980's. I think it would be great if he could find some of his lost friends and catch up. I would appreciate any information, seriously. Thank you.

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Ps. Might copy/paste this in some other subs. Not spamming.