U.S. Air Force 1st Lt. Thomas O’Brien, 86th Aircraft Maintenance Squadron support flight commander, holds an air ion counter at Ramstein Air Base, Germany, April 24, 2020. The counting device detects and quantifies positive and negative ions in the air, and is used as part of the validation process for ion distribution units. The ion distribution units must put out a defined concentration of ions to effectively sanitize the air in an enclosed environment. (U.S. Air Force photo by Airman 1st Class John R. Wright)