has a student society which represent and provide services for the students in their respective faculties. Services include online exam banks, resume critiques, and technical skills workshops. Some student societies also operate a student deal discount program and one to two shops selling coffee and food at low prices. Each faculty also operates a student-run endowment fund, which fund student design teams, laboratory upgrades, and services for their respective student societies. As of January 2015, neither the university administration nor the two main student unions recognize fraternities or sororities. Alpha Epsilon Pi, Pi Kappa Alpha and Sigma Chi operate as non-accredited off-campus fraternities, and Alpha Omicron Pi and Kappa Kappa Gamma as non-accredited off-campus sororities. Journalism The three main student publications on campus are Imprint, the university's official student newspaper, mathNEWS, the Math Society's free-form publication, and The Iron Warrior, the Engineering Society's newspaper. Imprint replaced The Chevron as the official student newspaper in 1979, and publishes a weekly edition during the fall and winter semesters and a biweekly edition in the spring semester. mathNEWS and The Iron Warrior publish biweekly in print and online throughout the year. The university formerly included a student-funded campus radio station, CKMS-FM. The student union withdrew financial support for the stations' operations in 2008 following several referendums and CKMS transitioned to a community radio model. Athletics The university's sports teams are known as the Waterloo Warriors. They participate in the Canadian Interuniversity Sports' Ontario University Athletics conference for most varsity sports. Varsity teams include badminton, baseball, basketball, cross country, curling, field hockey, figure skating, Canadian football, golf, hockey, Nordic skiing, rugby, soccer, squash, swimming, track and field, tennis and volleyball. The athletics program at the university dates back to 1957, when students of Waterloo College Associate Faculties participated in the sports program of Waterloo College. The university had its own independent team when the Associate Faculties officially became the University of Waterloo. The university's varsity teams and the university's recreational sports programs are operated and managed by the Department of Athletics and Recreational Activity. The university has a number of athletic facilities open to varsity teams and other students. Seating 5,400 people, Warrior Field is the university's largest stadium by seating capacity; and is used as the home field for the varsity field hockey and football teams, and hosts the university's recreational flag football and soccer activities. Prior to the completion of Warrior Field