Charger Village is reserved for sophomores, whereas upperclass students have the option of living at the other residence halls. Campus housing originated with the construction of Southeast Campus Housing. These suites were originally built under the auspices of the late Dr. Benjamin Graves, the first President of UAH, with the assistance of the late Alabama Senator John Sparkman. UAH is home to the following fraternities and sororities. Most Greek organizations rent a fraternity or sorority house from the university. Construction of the original houses was made possible by donations from Mark and Linda Smith and Jim and Susie Hudson. The Association for Campus Entertainment (ACE) is a student run and operated organization that hosts weekly events throughout the academic year as well as standing programs such as Friday Night Flicks, Sunday Cinema, Late-Night Breakfast, and ACE Wednesday. Notable guests include Daniel Tosh and Recycled Percussion. UAH has more than 185 student-run organizations on campus. Team UAH is internationally renowned for its award-winning concrete canoe construction competition team and is the current record holder with five national titles in 1993, 1994, 1996, 1998, and 2001. The National Concrete Canoe Competition is sponsored annually by the American Society of Civil Engineers. The UAH American Society of Mechanical Engineers student chapter also competes in the annual NASA Human Exploration Rover Challenge. It currently holds two championship titles. The UAH Space Hardware Club conceptualizes, designs, builds, tests, and flies hardware for high-altitude balloons, satellites (ChargerSat Program), the CanSat competition, and high-powered rocketry. Members must maintain a GPA of 3.0 to participate. The Student Success Center (SSC) offers tutoring for nearly all freshman- and sophomore-level courses offered at UAH. Additional tutoring is available for math courses online and in person. The SSC recruits university students for its PASS (Peer Assisted Study Sessions) program, in which students sit in on courses that they have already succeeded in, and offers class-specific study sessions outside of class, usually 3 hours per week. Historically difficult freshman courses are targeted for PASS, including calculus, chemistry, and economics. The College of Science houses the Alabama High Field Nuclear Magnetic Resonance (NMR) Center, which is dedicated to providing modern high field NMR capabilities to academic and corporate researchers in the state of Alabama and surrounding areas. UAH's Earth System Science Center is dedicated to the interdisciplinary study of the Earth as an integrated system with an emphasis on space- and ground-based remote sensing data.