George Carruthers, center, principal investigator for the Lunar Surface Ultraviolet Camera, discusses the instrument with Apollo 16 Commander John Young, right. Carruthers is employed by the Naval Research Lab in Washington, D.C. From left are Lunar Module Pilot Charles Duke and Rocco Petrone, Apollo Program Director. This photograph was taken during an Apollo lunar surface experiments review in the Manned Spacecraft Operations Building at the Kennedy Space Center.