For me, it has to be the theme for Rat Patrol. Ever since I was a kid when I first saw the series, that theme caught my fascination. A very close second would be Combat. How about you?

Not sure which I could pick as my favorite but, I do like the following WWII TV series themes well enough:

Theme from Baa Baa Blacksheep (aka) The Blacksheep Squadron..
Theme from: McHale's Navy.
Theme from Twelve O'Clock High.

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Lost are only those, who abandon themselves) Hans-Ulrich Rudel.

I like:

The main themes from Patton, the Longest Day and "Suicide is Painless" from M*A*S*H, with honoray mention to the themes from Hogan's Heroes and The Great Escape. As you can tell from my selections, save MASH, I like martial music.

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Best Regards,
JW

Dad's Army closely followed by It Ain't Half Hot Mum.

Opening titles. YouTube - Dad's Army

Closing titles. YouTube - Dad's Army=

YouTube - It Ain't Half Hot Mum Titles

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The Great Escape theme, by Elmer Bernstein, has got to be one of the best ever.

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Regards
John

"It is always wise to look ahead, but difficult to look further than you can see" - Winston Churchill

Who remembers the Colditz TV series of the 1970s.
I was never allowed to watch it we had to go to church, all I remember is the theme tune.
YouTube - Colditz Gone Away, Part 1 (clip 1)

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663 Squadron obviously and the theme of 'The World at War'.

Thanks for mentioning the Hogan's Heroes theme. I always did like that theme.

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Lost are only those, who abandon themselves) Hans-Ulrich Rudel.