NSI
MINOT AIR FORCE BASE, N.D. -- Staff Sergeant Blayne Souza, 5th Communications Squadron and Airman 1st Class Christopher Mills, perform back up battery tests during a previous Nuclear Surety Inspection here in 2009. An NSI is designed to evaluate a unit's readiness to execute nuclear operations. (U.S. Air Force photo by Staff Sergeant Stacy Moless)