| Military - note: | under a 1951 bilateral agreement, Iceland's defense was provided by a US-manned Icelandic Defense Force (IDF) headquartered in Keflavik; in October 2006, all US military forces in Iceland were withdrawn; nonetheless, the US and Iceland signed a Joint Understanding to strengthen their bilateral defense relationship, including regular security consultations, military communications in the event of national emergencies, annual bilateral exercises on Icelandic territory, and future bilateral and NATO support to four Iceland Air Defense System (IADS) radar sites |