MOODY AIR FORCE BASE, Ga. -- Edd Hartman, site supervisor for TolTest Inc., shows Tech Sgt. Ron Killen, 23rd Logistic Readiness Squadron fuels storage element assistant NCO-in-charge, a cross section of the floating roof that seals fuel in 5,000 and 10,000-barrel tanks. (U.S. Air Force photo by Tech. Sgt. Parker Gyokeres)