A mock-patient is tended to at the isolation unit at the University of Nebraska Medical Center/Nebraska Medicine, in Omaha, Neb., Wednesday, April 12, 2017, during a training exercise dubbed "Operation Tranquil Shift," in which mock-patients with highly infectious diseases have been flown from Africa to five receiving facilities across the U.S. (AP Photo/Nati Harnik)
Brian Curtis demonstrates how to use a HoloLens self contained interaction computer prior to a groundbreaking ceremony for the future Dr. Edwin & Dorthy Balbach Davis Global Center for Advanced Interprofessional Learning at the University of Nebraska Medical Center Monday, April 3, 2017, in Omaha, Neb. (Brendan Sullivan/Omaha World-Herald via AP)
Brandon Valle, an Army soldier and student at the University of Nebraska Omaha, is being hailed a hero after he helped take down a knife-wielding attacker at the college library. (WOWT)
Chief Justice John Roberts speaks at the University of Nebraska Lincoln in Lincoln, Neb., in this Sept. 19, 2016, file photo. (AP Photo/Nati Harnik, File)
Defense Secretary Chuck Hagel speaks in Strauss Performing Arts Center at his alma mater, the University of Nebraska at Omaha, in Omaha, Neb. on Wednesday, June 19, 2013. (Associated Press)
A fan holds a sign before the team's arrival at Penn State's Beaver Stadium before their game with the University of Nebraska Saturday, Nov. 12, 2011 in State College, Pa. Penn State played for the first time in decades without former head coach Joe Paterno, after he was fired in the wake of a child sex abuse scandal involving a former assistant coach. (AP Photo/Alex Brandon)