Visit RNC's website. Go to "daily burial services" > select Riverside national cemetery as your cemetery >enter the last name of the deceased. First name is optional. > hit search.
As you enter the cemetery, there's a guard shack that will direct you to the offices that you need.
There is a guard / information shack at the entrance if you're in need of a map of the grounds. Hope this helped.
Thanks! Your answer is awaiting moderation.