U.S. Air Force Airman 1st Class Dillan Bonick, 7th Medical Support Squadron laboratory technician, places dry ice into a package in the laboratory at Dyess Air Force Base, Texas, Nov. 29, 2018. The laboratory will occasionally send out highly complex tests, such as human immunodeficiency virus tests, to another base which holds the equipment capable to perform the examinations. Dry ice is used to keep the samples at a cool temperature. (U.S. Air Force photo by Airman 1st Class Mercedes Porter)