If guards see a person loitering, they ask the person if he or she is a student or a visitor. Guards check students' campus identification cards and question visitors about whom they're visiting, he said.
Guards also serve as a visible presence on campus, which helps the university demonstrate that it takes security seriously, Storr said.
“They'll be our eyes and ears for us,” he said.
The 2010 incident wasn't Langston's first instance of campus violence. On Aug. 16, 2009, four people who weren't students were shot and wounded after a back-to-school party.
A month later, on Sept. 28, another gunman fired shots during an argument outside the Scholars' Inn Complex dormitory. No one was injured.
In the wake of the shootings, university officials invested more than $200,000 to improve security. Welcome shacks were set up at university entrances so no one could get in without campus police knowing why they were there.
More lighting and video cameras were installed throughout the campus, and university officials implemented an emergency alert system allowing them to warn students, faculty and staff of potential dangers via email, cellphones and other means.