A student at Leo Catholic High School walks through the hallway at the school in Chicago, Illinois February 14, 2013. In places like Chicago's Leo Catholic boys' high school, student numbers have plummeted from 1,200 students in the 1950s to around 150 this year. This decline has implications for schools throughout the nation, say Catholic school supporters. According to the National Catholic Education Association, the 2 million U.S. students they serve save the nation approximately $21 billion a year in public school costs. Photo taken February 14. REUTERS/Jim Young (UNITED STATES - Tags: SOCIETY RELIGION EDUCATION)