I like primsong's idea that he must've regenerated into wearing an "I heart Kansas" button . . . ; )
As for what's going on with the museum / radio signal / V2 rockets / Nazis, it's perfectly obvious. Once you've got the Doctor learning he's the Master's half-human brother, descended from Rassilon, rightful inheritor of the Sash, with Borusa as his grandfather and a weathered Kansas Time Lord farmer as his and the Master's father, well, Nazis are just going to have to show up next, aren't they? It's practically a cliche.
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As for what's going on with the museum / radio signal / V2 rockets / Nazis, it's perfectly obvious. Once you've got the Doctor learning he's the Master's half-human brother, descended from Rassilon, rightful inheritor of the Sash, with Borusa as his grandfather and a weathered Kansas Time Lord farmer as his and the Master's father, well, Nazis are just going to have to show up next, aren't they? It's practically a cliche.