Senior Airman Bruce Hack, 28th Logistics Readiness Squadron fuels technician, uses a conductivity meter to measure the amount of static dissipater additives in a sample at the fuels lab at Ellsworth Air Force Base, S.D., March 26, 2013. Fuel must be free from static, which could lead to ignition and damage to an aircraft. (U.S. Air Force photo by Airman 1st Class Anania Tekurio/Released)