The Iceland Defense Force (IDF) was a army command of the United States Armed Forces from 1951 to 2006. The IDF, established at the ask for of NATO, arrived into existence when the United States signed an agreement to supply for the defence of Iceland. The IDF also consisted of civilian Icelanders and armed forces members of other NATO nations. 1999 NATO bombing of Yugoslavia. Fleming J, Mullen PE, Sibthorpe B, Bammer G (February 1999).