Not just WWII, but also Korea and Vietnam. We didn’t finish the job in Korea and that area is still a major problem. We set a time table for withdraw in Vietnam (just as the North was considering suing for peace) and we lost it all.
NEVER tell the enemy what your plans are unless those are not actually your plans.
Yes,those too. I was thinking of the long occupation that allowed Japan and Germany to assimilate and become democratized.