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I am not a MacArthur fan so I am biased on this one.
WI Roosevelt ordered MacArthur to stay with his men on the Phillipines in 1942. MacArthur fights a good fight and then surrenders as Wainwright had to OTL. The Japanese treat him as a semi VIP prisoner while his men die on the Bataan death march.
How would this affect the Pacific war. IMO it would be better for the US.