Photo essay: Airfield systems Airmen protect runways Published March 25, 2010 By Public Affairs staff 22nd Air Refueling Wing MCCONNELL AIR FORCE BASE, KAN. -- Airmen from the 22nd Communications Squadron perform preventative maintenance on McConnell's Tactical Air Navigation system periodically to maintain its integrity. The $250,000 TACAN is a system used by all military to help guide aircrew to a military airfield. To view the slideshow, click here.