I find this type of thing more frequently in Kansai and northern Kyushu.
Maybe Kanto just got more officers and NCOs from the better parts of
the US.
There seem to be very big differences in who knows what English in
several locations and the current spoken varieties seem to be extremely
different in Yomitan, Sasebo, Iwakuni, and Yokosuka. Also, "parking
lot" in Kanto is a "motor pool" from Nagoya southward, but several
elderly Japanese have told me that the units stationed around Tokyo were
mostly Anzac, Scots, and US heavy infantry and paratroops while Kansai,
Chugoku, and Kyushu got motorized armor, motorized infantry, and
artillery due to the fact that it was easier for deep water vessels to
offload armor at Kobe, Kokura, Shimizu, and Iwakuni than at Hinode or
Kujukuri.
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CL