A non-immigrant visa is required for the spouse in case the US Citizenship and Immigration Services have received the form, but the immigrant visa application is still under approval process.
A Fiancé visa is issued in the case when one partner will be traveling to the US in order to get married there as a US citizen and get an indefinite residence.
In all three cases, the application form must be filled in. A similar visa can be issued for the accompanying children and Pacific Migration Solutions specialists will be happy to assist you with meeting the requirements. However, every situation might be different and the help of professionals could be useful.