Found a bunch of older Discovery/History Channel shows (I gave up my DVR, so now I have to actively look for stuff instead of just click 'record' on whatever seemed interesting):
Clash Of Wings
13 part show about the aviation aspect of WWII. It basically runs through the war but tells about it from the point of view of aerial operations. Haven't watched all of 'm but the first couple of episodes had great footage of early-/prewar planes (Henschel 123's in action over Poland, Junkers Ju86, Whitley's over Berlin)
It's from the late 90's so none of the current day over-anxious editing or crappy CGI, just a guy telling stuff and a shitload of archive footage.
Vietnam: The Unseen War
One-off doc about North Vietnamese combat photographers. Vietnam was of course the first televised war, but 'we' only got to see the US perspective. The North had a few dedicated photographers and filmers and in this doc a former American reporter goes out looking for his Norhtern colleagues. Incredible photos, and completely original in the sense that they weren't used outside of NV territory.