Definitions for "National Service"
Any Corporation funded program, including AmeriCorps, Learn and Serve America, and National Senior Service Corps, regardless of whether such program offers stipends or educational awards.  ("national service" in lower case refers to the broader field of national efforts, including those operating abroad, like Peace Corps and those focused on military, rather than civilian service).
(United Kingdom) compulsory service in the military during peacetime
conscription into the armed services; called "the draft" in America.