Before 468221 was a XB-26H, it WAS a B-25G. So the tandem or bicycle landing gear apparently is what distinguished this aircraft. Now why was it supporting this arrangement? What drove this design?? And name the aircraft this XB-25H helped out in design...

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“The first lesson is that you can't lose a war if you have command of the air, and you can't win a war if you haven't.” - General Jimmy Doolittle