What countries formed the North Atlantic Treaty Organization?

It includes the five Treaty of Brussels states, as well as the United States, Canada, Portugal, Italy, Norway, Denmark and Iceland. France will now join as of march 15th, 2009, Holland was one of the 1st nations to join.
The original twelve members of NATO were the United States, the United Kingdom, Canada, France, Denmark, Iceland, Italy, Norway, Portugal, Belgium, Netherlands, and Luxembourg. Today there are 28 members of the Alliance. NATO was formed after the 1949 blocade of Berlin by the Soviets.
Greece