Dillion Cunningham, director of special projects for the National Strategic Research Institute at the University of Nebraska, collects a surface sample for particle disposition, April 6, 2020, from inside a C-17 military transport aircraft located at the Nebraska National Guard air base in Lincoln, Nebraska. The U.S. Air Force’s Air Mobility Command, in coordination with the University of Nebraska Medical Center and the Defense Advanced Research Projects Agency, conducted airflow tests on several different aircraft at the 155th Air Refueling Wing to assess measures to prevent aircrew and support personnel from contracting or transmitting the virus while transporting COVID-19 patients.