Joseph Weyland (born 24 April 1943) is a Luxembourgian diplomat and was Luxembourg's Ambassador to the United States from 2 March 2005 to 2008.
 In addition, he is concurrently accredited to Canada, Mexico, and the Organization of American States (OAS).
 He had previously been Permanent Representative to the United Nations in New York (1983 – 84), Permanent Representative to the European Union (1984 – 91), Ambassador to the United Kingdom (1993 – 2002), and Permanent Representative to NATO (2003 – 05).
The United States Permanent Representative to NATO (commonly called the U.S. Ambassador to NATO) is the official representative of the United States to the North Atlantic Treaty Organization.
 The Representative has the rank of full ambassador and is appointed by the President and confirmed by the Senate.
 The full official title of the Representative is United States Permanent Representative on the Council of the North Atlantic Treaty Organization, with the rank and status of Ambassador Extraordinary and Plenipotentiary.
 The current U.S. Ambassador to NATO is Kay Bailey Hutchison.
Enlargement of the North Atlantic Treaty Organization (NATO) is the process of including new member states in NATO.
 NATO is a military alliance of twenty-seven European and two North American countries that constitutes a system of collective defense.
 The process of joining the alliance is governed by Article 10 of the North Atlantic Treaty, which allows only for the invitation of "other European States", and by subsequent agreements.
 Countries wishing to join have to meet certain requirements and complete a multi-step process involving political dialogue and military integration.
 The accession process is overseen by the North Atlantic Council, NATO's governing body.
The United States European Command (EUCOM) is one of nine Unified Combatant Commands of the United States military, headquartered in Stuttgart, Germany.
 Its area of focus covers 21000000 sqmi and 51 countries and territories, including Europe, Russia, Greenland, and Israel.
 The Commander of the United States military EUCOM simultaneously serves as the Supreme Allied Commander, Europe (SACEUR) within NATO—an intergovernmental military alliance.
 During the Gulf War and Operation Northern Watch, EUCOM controlled the forces flying from Incirlik Air Base.
The North Atlantic Treaty Organization (NATO ; French: "Organisation du Traité de l'Atlantique Nord" ; "OTAN "), also called the North Atlantic Alliance, is an intergovernmental military alliance between several North American and European states based on the North Atlantic Treaty that was signed on 4 April 1949.
Frank Majoor (born 1 April 1949, Tilburg) is the Permanent Representative of the Kingdom of the Netherlands to NATO.
 He started in this position in 2009, from 2005 he was the Permanent Representative to the United Nations before which he was the secretary general of the Ministry of Foreign Affairs.
 He is a member of the Christian Democratic Appeal.
The Collective Security Treaty Organization (CSTO; Russian: Организация Договора о Коллективной Безопасности , "Organizacija Dogovora o Kollektivnoj Bezopasnosti", ODKB) is an intergovernmental military alliance that was signed on 15 May 1992.
 In 1992, six post-Soviet states belonging to the Commonwealth of Independent States—Russia, Armenia, Kazakhstan, Kyrgyzstan, Tajikistan, and Uzbekistan—signed the Collective Security Treaty (also referred to as the "Tashkent Pact" or "Tashkent Treaty").
 Three other post-Soviet states—Azerbaijan, Belarus, and Georgia—signed the next year and the treaty took effect in 1994.
 Five years later, six of the nine—all but Azerbaijan, Georgia, and Uzbekistan—agreed to renew the treaty for five more years, and in 2002 those six agreed to create the Collective Security Treaty Organization as a military alliance.
 Uzbekistan rejoined the CSTO in 2006 but withdrew in 2012.
Canada has been a member of the North Atlantic Treaty Organization (NATO) since its inception in 1949.
 Canada was not only a member but one of the principal initiators (founding countries) of the alliance.
 This Atlanticist outlook was a marked break with Canada's pre-war isolationism, and was the first peacetime alliance Canada had ever joined.
 However, Canadian officials such as Hume Wrong and Lester B. Pearson and including Prime Minister Louis St. Laurent worked in favour of the alliance not only because they sought to contain the Soviet Union, as did other members, but because they hoped the treaty would help to eliminate any potential rivalries between the United States, the United Kingdom, and other European great powers (principally at the time France, but later including West Germany), where Canada would be forced to choose sides.
 This had long been the overriding goal of Canadian foreign policy.
 The main Canadian contribution to the North Atlantic Treaty was Article 2 which committed members to maintain a "free" political system and to promote economic cooperation, in addition to the more usual diplomatic and military matters.
 However trans-Atlantic unity in political and economic matters has not come to fruition, as European states have looked toward the European Union and its antecedents while North America has the North American Free Trade Agreement
The North Atlantic Treaty Organization or NATO ( ; French: "Organisation du traité de l'Atlantique Nord (OTAN)" ), also called the (North) Atlantic Alliance, is an intergovernmental military alliance based on the North Atlantic Treaty which was signed on 4 April 1949.
NATO is the North Atlantic Treaty Organization, an intergovernmental military alliance.

Question:  Frank Majoor is the Permanent Representative of the Kingdom of the Netherlands to an intergovernmental military alliance between several North American and European states based on a treaty that was signed when?
Answer: 4 April 1949