LATHAM, N.Y. -- Members of the Liberty Bells, a USO Show Troupe sing to New York Army National Guard Col. David Martinez during Christmas lunch festivities on Dec. 19. They are (from left) Stephanie Gerson, Karley Willocks, and Melissa VanPelt The singers performed holiday carols and a medley of World War II era classics and patriotic favorites, a USO trademark. Since 1941, the United Service Organizations Inc., a nonprofit organization, has provided programs, services and live entertainment to United States servicemen and women to boost morale.