Petty Officer 1st Class Brian Levins greets a visitor in the aquarium at Henry Doorly Zoo in Omaha. Levins and three other Navy divers assigned to Mobile Diving and Salvage Unit 2 were part of the shark tunnel display for the zoo's Navy Day celebration, one of many events during Omaha Navy Week. Navy Weeks are designed to show Americans the investment they have made in their Navy and increase awareness in cities that do not have a significant Navy presence.