Lt. Michael Kavanaugh, front, Preventive Medicine entomologist, from Jenks, Okla., and Petty Officer 1st Class Robyn Murillo, from Lebanon, Mo., take water samples from a boat during their tour of looking for contaminated water in Puerto Barrios, Guatemala. The multi-purpose amphibious assault ship USS Iwo Jima is anchored off the coast of Guatemala conducting Continuing Promise 2010, a humanitarian and civic assistance mission. The assigned medical and engineering staff embarked aboard Iwo Jima are working with partner nation teams to provide medical, dental, veterinary and engineering assistance to eight different nations.