Tickets are given out on a first come basis and there are only a limited amount of tickets given out each day. So if you go, try an arrive early. By early, I mean before 8:30am. This will ensure you of a ticket and make the wait to go over to the Memorial short. Because of security concerns you will not be allowed to bring into the memorial any backpacks, purses, or other bags. Each time I have been, they did allow my camera bag, but don't count on it. If you end up with a wait longer than 3 hours, it is a good opportunity to see the USS Missouri or the Blowfin Submarine.