[William McKinley]

Not only this- but shortly after getting his deferral because of a back condition, he buggered out to the rockies for some black-diamond skiing.

[Gritty]

deferral because of a back condition

Dean had spinal problems that kept him from serving his country?

That's odd. Our last President had spinal problems that kept him from serving his country also. Isn't it wonderfully strange how history tends to repeat itself!