I remember him as Col. Clarence E. Pitts in the film ‘The Eagle Has Landed’

RIP.

Yes,
I also recall another movie in which he was a Helicopter pilot, vietnam vet.
Jeannie was watched as a kid, but can’t say I rushed home for it.
As for Dallas, I confess I never missed a single episode. Even the very start of it, which was on BBC2 8pm Monday night slot (1)………..and it was Terry Wogan which yammered on about it on his Breakfast radio every week until viewing figures made it clear it was a winner and a Saturday nighter.

(1) I alays used to watch this 8pm because it was BBC’s “Give it a try” slot.
Alias Smith and Jones were on that, Kelly Montieth show and lots more.