Marriage Visas before marriage.
However, if meeting before the marriage for acquiring marriage visas would violate the customs of one of the parties, or if it would create extreme hardship, that requirement can be waived. And yes, USCIS is going to want documentation of the customs or hardship, as well.
Evidence of U.S. Citizenship for the bride or groom in the United States is required, such as a birth certificate showing birth in the United States.
Two color photos will be required, one of each of you.