The Me 262 was captured by the US Air Force, March 31, 1945 for the test flight.

A Captured Me 262

Aerial view of a B-17 from the 305th Bomb Group, 8th Air Force bombing Stargard Germany, Oct. 6 1944. (Wehrmacht39)

Bombing Stargard

The Northrop YB-49 jet powered 'Flying Wing' prototype built shortly after WW2. This aircraft was never put into production being passed over in favor of the Convair B-36. I have listed this photo only to bring attention to the obvious, exceedingly close similarities to the HO 1X V2 