U.S. Navy Petty Officer 2nd Class Vanessa Smith examines an organism sample through a microscope. U.S. Navy Petty Officer 2nd Class Vanessa Smith examines an organism sample through a microscope in Pearl Harbor, Hawaii, on Feb. 7, 2006. Smith is a Navy hospital corpsman assigned to Navy Environmental and Preventative Medicine Unit Six. The unit aids in the combat readiness of operational forces in the Pacific region by providing specialized environmental and preventive medicine support. SHARE: Download: Full Size (0.13 MB) Credit: VIRIN: 066253-D-CYL85-470.jpg Photo Gallery