An old discussion..(the following text is an extract of various web sites):
"Reichskriegsflagge" (war flag): the military version of the National swastika flag".
This flag was used only in wartime; as a matter of fact most were used by the German Navy; however, the use was not restricted to the Kriegsmarine. The army and air force used it, as well. Often you see them in pictures flying from the city halls in conquered territories. Most of them (but not all) had a marking with an eagle over a "kapital M", which means the flag was Kriegsmarine approved. Thousands of them were seen on returning caskets of fallen hero soldiers.
The "Decree about the Reichskriegsflagge, the jack of the warships, the merchant flag with the iron cross and the flag of the Minister of war and supreme commander of the Wehrmacht" (5 Oct 1935) says:
..."The Reichskriegsflagge is the national emblem of the Wehrmacht. The flag shall be shown on the Kriegsmarine (navy) warships, on the Luftwaffe (airforce) airplanes and the buildungs of the entire Wehrmacht."...
There were two patterns of this flag, one from was in use from 1935 until 1938, the other from 1938 until 1945

I've never seen a pic of a Tiger flying the Reichkriegsflag for aerial recognition, but maybe there is photo-evidence....