student organizations dedicated to community service and/or social awareness. Some of these include Big Brothers Big Sisters, Gay Straight Alliance, Engineers Without Borders, and Empowerment. Marquette's on-campus security is composed of the Department of Public Safety and Student Safety Program employees. Students on campus use services provided by the two organizations including the LIMO program, an entirely student staffed transportation service, which is the first of its kind in the country. Greek life Marquette University is host to 23 Greek organizations and, as of 2009, 10% of the total undergraduate student body is active in Greek life. Sororities are slightly more popular than fraternities, with 11.7% of the female student population involved in Greek life, compared to 7.45% of men. As of 2012, Alpha Phi was Marquette's largest sorority and Kappa Sigma the largest fraternity. Currently, the all-Greek grade point average is higher than the all-university average, and members of Marquette Greek organizations contributed over 5,200 hours of volunteer service to the community during the 2010–11 academic year. The international engineering sorority Alpha Omega Epsilon was founded at Marquette on November 13, 1983. Student government Marquette University Student Government (MUSG) serves as the official voice of the student body to university administration, promotes and sponsors campus events, and supports other student organizations. MUSG was formerly known as the Associated Students of Marquette University (ASMU). Performing arts Acting and comedy Among the various stage performance groups at Marquette are the Studio 013 Refugees, a student improv comedy group. The Refugees perform free shows throughout the year, including a 12-hour outdoor show on campus, and they provide workshops on improv comedy. The Marquette University Players Society (MUPS) is a platform for student-produced theater and performs in a traditional theater setting. In addition to acting, MUPS members also work as stage managers, designers, technicians, ticket sellers, and marketing personnel. Vocal and dance The Marquette University Chorus, the longest standing choral organization on campus, is a mixed choir of fifty to sixty men and women who share their time, talents, and passion for music with others at Marquette and throughout the community. There are Men's Choir, Women's Choir, and Chamber Choir. Marquette also has a Gospel Choir and a Liturgical Choir which sings weekly at Mass at Gesu. There are three selective a cappella groups that interested students may try out for: the coed Gold 'n Blues, the all-male Naturals, and the all-female Meladies.