The flag of Montenegro was raised at NATO Headquarters on Wednesday 7 June 2017 in a special ceremony to mark the country’s accession to NATO. Flag raising ceremonies were also held simultaneously at Allied Command Operations (SHAPE) in Mons and Allied Command Operations in Norfolk, Virginia. Montenegro became the 29th member of the Alliance on Monday 5 June 2017 when it deposited its instrument of accession to the North Atlantic Treaty with the US State Department in Washington DC.