Your military retirement is divided like this - She will be entitled to 1/2 of the retirement you earned while married (minus SBP payments - Try to get children only - and any disability). I served for 21 years, was married for 15, so she get 37%. If you were married when you joined and are not separated prior to your discharge, she will be entitled to 50%. And all of this is negotiable.
Once it is in the decree, the retirement pay will count as income for both of you.
Whatever percentage disability you receive, it is against Federal law for her to have any claim against. It is taken away from your retirement total.
If you get divorced prior to your discharge, remember - She is only entitled to a percentage of your TAXABLE income. My lawyer screwed me on that one! No BAH, Sep Rats, COLA, only base pay.
Hope this helps,