The Battlefield Airborne Communications Node (BACN) is a United States Air Force (USAF) airborne communications relay and gateway system hosted on a variety of aircraft designated as the EQ-4B (Global Hawk variant) and E-11A (Global Express modification). BACN enables real-time information flow across the battlespace between similar and dissimilar tactical data link and voice systems through relay, bridging, and data translation in Line of Sight (LOS) and Beyond Line of Sight (BLOS) situations. By acting as a translation proxy between dissimilar communications systems, it allows interoperability without modification to the individual platforms' systems.
Because of its flexible deployment options and ability to operate at high altitudes, BACN can enable air and surface forces to overcome communications difficulties caused by complex mountainous terrain and range while performing as a key node for tactical networks. BACN provides decision-makers at all operational echelons with critical information and increases situational awareness by correlating tactical and operational air and ground pictures. For example, an Army unit on the ground currently sees a different picture than an aircrew, but with BACN, both can see the same picture.
On 22 February 2010, the Air Force and Northrop Grumman BACN Team received the 2010 Network Centric Warfare Award from the Institute for Defense and Government Advancement.