Senior Airman Kevin Finstuen, 35th Communications Squadron airfield systems technician, adjusts the gain on the Very-high Frequency Omni-system insuring optimal signal output Jan. 20, 2011, Misawa Air Base, Japan. The VFO is part of a larger system known as the VORTAC, which combines the VFO, for civilian aircraft, and the Tactical Air Navigation System, for military aircraft, to guide planes safely to Misawa Air Base. (U.S. Air Force photo by Tech. Sgt. Phillip Butterfield)