They need to get into groups of similar vets if possible.
My co-worker is very involved in the Chattanooga Chapter of the Combat Veterans Motorcycle Association. It’s not a biker club like the Hells’ Angels, but a nationwide association that has members in most every state. Depending on their condition and whether they have motorcycles (3 wheels Ok), they could join such a group.
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They crave being around people their own age with the same experiences. We used to ride with other Vets and people of that age group back when he was young enough to ride. We hit a lot of roads in the Smokies and around Cleveland GA., Blue Ridge Parkway, and other mountain roads.