The North Atlantic Treaty Organization is a multinational military alliance headquartered in Brussels, Belgium. It was formed in 1949 as a counter to the Soviet Union, though (to the surprise of some political analysts) it remained in existence despite the end of the Cold War.
Transformers Legends anthology
A NATO peacekeeping force commanded by Major Joseph Bergstrum was deployed to the Socialist Democratic Federated Republic of Carbombia as a result of a civil war in the African nation.
Live-action movie franchise
Following the Decepticon conquest of the United States of America, NATO tried both communications and conventional military force against the Decepticons, to no avail; cities like Paris came under attack as well. The crisis caused Russia to join NATO (pushing for weeks for a nuclear assault on America) and its headquarters in Belgium seemed to cease existing, with NATO operations being commanded from the Palais Bourbon in Paris. Eventually, a nuclear assault was ordered, with fleets in the Bay of Biscay and Newfoundland preparing to attack...when the Decepticons whacked them first. Ten minutes of combat saw NATO losses of 11,506 before the Decepticons finished their victory by obliterating the Palais Bourbon and everyone in it.
Despite this loss, NATO remained active and in better shape than the United States Armed Forces. Tank regiments were sent into post-occupation America, and NATO assumed operational command of anti-Transformers action on American soil. While command is held by Supreme Allied Commander Europe (SACEUR) in, yes, Europe, the Allied Command Transformations in Norfolk, Virginia is still operational (possibly rebuilt after the occupation).