Gen. Craig R. McKinley receives his fourth star from Defense Secretary Robert M. Gates and takes charge of the National Guard Bureau. He is the first four-star general to head the NGB and the first Air Force officer since 2002.
An Air Force C-17 transport jet recently tested a new technology that could help aviators stay on course even if the satellite-based Global Positioning System (GPS) that much of modern-day aviation relies on is compromised.