I had to look that up to know what you meant. I hadn't realized Norman Burton had played Leiter. Apparently he also had roles in two Planet of the Apes movies and the '74 TV series of same (which IMDb oddly lists as a "TV mini-series" rather than what it was, a series that got quickly cancelled).
Mini-series? How did IMDB cough that one up? Geeze. That's not even trying to source readily available information.
Anyway, I've been thinking about the theme song and wondering why they so drastically changed the lyrics. There were only a couple of lines in the first-season lyrics that were specific to the WWII period. The second verse had "Make a hawk a dove / Stop a war with love / Make a liar tell it true," and the third had "Stop a bullet cold / Make the Axis fold / Change their minds and change the world." The first one of those could've been left unchanged, or maybe replaced with "Conquer hate with love," say. Finding a replacement for the Axis line is a bit trickier -- "Make the villains fold," maybe, but that's weak. How about "Make the timid bold"? In any case, they could've just tweaked a few syllables, but instead they replaced the whole verses with much worse lyrics. That's a shame.
Yes, it is a shame, as the music end remains a strong piece.