Wife and I both have that flat Midwestern accent, I am a natural and unaware mimic and will be speaking like whomever I am speaking with if I am not real careful. It has got me in trouble a time or two.
Me too- especially with a Norwegian accent. I AM NOT MOCKING YOU!!!
I don't know why... except my mother was of half Squarehead descent. I'll blame it on her!
An older brotherr sent 12 years in the Air Force in Texas. Never did loose the accent, even 20 years after moving back to Alaska.