Indeed so Article Six refers:Doesn't NATO's area of responsibility only reach as far as the Tropic of Cancer?
Article 6
For the purpose of Article 5, an armed attack on one or more of the Parties is deemed to include an armed attack:
*On January 16, 1963, the North Atlantic Council noted that insofar as the former Algerian Departments of France were concerned, the relevant clauses of this Treaty had become inapplicable as from July 3, 1962.
- on the territory of any of the Parties in Europe or North America, on the Algerian Departments of France*, on the territory of Turkey or on the Islands under the jurisdiction of any of the Parties in the North Atlantic area north of the Tropic of Cancer;
- on the forces, vessels, or aircraft of any of the Parties, when in or over these territories or any other area in Europe in which occupation forces of any of the Parties were stationed on the date when the Treaty entered into force or the Mediterranean Sea or the North Atlantic area north of the Tropic of Cancer.
The North Atlantic Treaty
www.nato.int
But that would still have been an armed attack on one of the parties in the relevant area! Would have been an interesting diplomatic conundrum.