What is core shift?

Hey dusted

A little off the subject, but every time I see your new avatar (I like it)
I think of my nephew David (needahotrod) here on the Forum. He spent
some time in the sand box during Desert Storm. He was a M88 driver and
Bradley mechanic.

I always kid him about the second picture...I hit him with Rambo:D

He's still in the Active Reserves...just turned in his packet for Sgt. Major

When's your date up or are you career?