My husband of 12 yrs. is currently paying his first wife half of his military pension. Would he be required to do the same for our divorce?

A military pension is generally a divisible marital asset in Wisconsin. The court has discretion to deviate from presumed equal property division based on the number of years he served in the military, along with how many years you are married. Also, the fact that his pension has already been divided once may be a factor that the trial court might consider in terms of its current division in your case. I believe the military has a rule also that you have to be married at least 10 years to claim entitlement to the benefit, which obviously you meet after being married 12 years of marriage.