Two words: Manhattan Project. Unless you remove the A-bomb from the 

scene,

Germany will get nuked instead of Japan if WW2 is still going on by 

1946.

If the A-bomb could be delivered to Germany to begin with the war is 
already over. 

Walkers won't be of any help. With the attitude of the time, they would 

have

been lobbing A-bombs all over Europe to stop those walkers if they had 

to.

Um, no. A-bombs would be worthless as a real tactical asset of the time. 
Remember that the US had exhausted their stockpile of two atomic weapons 
by the time of Japan's surrender.

With the tech of the time (no integrated circuits, advanced alloys or
syntetics), they'd be lucky to develop something that works like the 

(legs

of) AT-ST in 'Star Wars'. A humaniod form like the EVAs is just too
vulnerable with 40's tech. It would have to be a squat armored box, 

like the

AT-STs again.

The idea of a walker to begin with is ridiculous; a traditional 
wheeled/tracked vehicle will deliver all the mobility, firepower and 
protection of any walking device, and do it much, much more efficiently.

Another thought for you is that the Allies need NOT build small 

walkers. The

US has all the resources it need to build giant walking fortresses if 

they

have to. If they had to use large cumbersome hydraulics to drive the 

walker

legs they could afford to.

They sure could. They just couldn't move them in numbers that matter to 
the battlefield.

If walkers are to be integrated into a 40s scenario, there will have to 
be some sort of technological breakthrough that will make them 
strategically decisive weapons.

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