Arnor Sigurjonnson, National Representative to NATO for Iceland, and Jon Gudnasson, Chief of Integrated Air Defense System, questions U.S. Army Lt. Col. Chad Jackson, Combined Endeavor test director, at the Joint Interoperability Testing Command during CE 2012, Joint Multinational Training Command, Grafenwoehr, Germany, Sept. 19, 2012. JITC enables international interoperability by maintaining a database of information obtained from participating countries from the last 18 years of CE's existence. CE12 is a multinational command, control, communications and computer systems exercise designed to build and enhance communications and network interoperability between 41 nations and international organizations.