Gew,
Vesting is typical -- 5 years.
However, with the change in CEO a couple of years ago, the writing was on the wall for a change from employee owned to publically traded.
I'm not sure that it's a good thing, and I personally don't believe that SAIC will be around in 5 years -- I think it will be snapped up.
That said, I've got my stock, and I'll ride it out.