there are troops 67,000 in Japan
I could be completely mistaken, but I don't think the US had any ground troops in Japan at the time.
Japan
The estimate were 100,000 casualties for the US.
Roosevelt seen that the US would loose way to many US troops against Japan, therefore used atomic weapons.
40,000,000 troops
well the u.s. responded with sending in troops to Philippines.
The total number of troops supplied by those nations was well over 7 million, on the low end. Probably more.
japan
The U.S. has had a strong presence in japan since the end of WW2 particularly on the island of Okinawa
Certainly Japan could not have made a massive withdrawal of troops they had in China and Manchuria late in 1944. But they did have close to two million troops. At least 500,000 battle tested troops could have been sent eastward to defend Japanese held islands against the steady advance of the US's island hoping troops. They failed to do this, reasons are unknown.
Well, the bases are still there and Japan would not do a thing without proper approval from the US.
There are approximately 68,000 US Troops stationed in Germany.