Check with the sheriff departments and local law enforcement flight departments. Lots of former Army Aviators are flying for law enforcement and there are hundreds of OH-58's (A and C models) were sold to law enforcement in the last 10 years. I flew OH-58's also and I have tracked down a few that I flew in the 101st back in the 80's that are in central Florida now. I bet if you get with the right folks they would be willing to take you dad for a flight since he is retired Army. Best of luck!