You should submit evidence to the National Visa Center along with Form I-864. On Form I864, petitioners must prove that they have the ability to financially support the visa applicant(s) if necessary.Online Application for State Domicile Certificate. Please fill out the form and attach with a copy of your PCS orders along with any amendments if applicable 10 days prior to final out. Advance DLA DD Form 1351. This guide will clarify what domicile is, how to establish it, and the documentation you need for proof of domicile.