Airman 1st Class Mason Kitchens, a 28th Communications Squadron radio frequency transmission systems technician, uses an oscilloscope, which is a device used to see changes in an electrical signal over time during the Cyber Storm exercise at Ellsworth Air Force Base, S.D., May 14, 2018. Cyber Storm is in its second year and is used to help the 28th CS find cybersecurity weaknesses so they can be more effective in a cyber-contested environment. (U.S. Air Force photo by Airman 1st Class Thomas Karol)