Question: In what year did Iver Johnson begin selling the standard-issue sidearm for the United States Armed Forces from 1911 to 1986?

Context paragraphs:
Browning Hi-Power BDA: The Browning Hi-Power BDA ("Browning Double Action") is a 9mm semi-automatic pistol developed in the early 1980s at the Belgian Fabrique Nationale arms factory in Herstal.  The pistol was conceived in 1983 to compete in the U.S. XM-9 Pistol Trials to select new sidearm chambered for the 9×19mm Parabellum cartridge that would equip all the branches of the United States armed forces.  Ultimately, the winner of the bid was the Italian Beretta 92F.  The Finnish Defence Forces accepted the weapon into service as their general service pistol under the designation 9.00 PIST 80 and 9.00 PIST 80-91.  The pistol was marketed in Europe as the HP-DA.

Iver Johnson AMAC-1500: The Iver Johnson AMAC-1500 is a manually-operated sniper rifle/anti-materiel rifle developed by Research Armaments Prototypes (RAP) and manufactured by Iver Johnson Arms in the 1980s, and used by the US Armed Forces.

M1911 pistol: The M1911 is a single-action, semi-automatic, magazine-fed, recoil-operated pistol chambered for the .45 ACP cartridge.  It served as the standard-issue sidearm for the United States Armed Forces from 1911 to 1986.  It was widely used in World War I, World War II, the Korean War, and the Vietnam War.  The pistol's formal designation as of 1940 was Automatic Pistol, Caliber .45, M1911 for the original model of 1911 or Automatic Pistol, Caliber .45, M1911A1 for the M1911A1, adopted in 1924.  The designation changed to Pistol, Caliber .45, Automatic, M1911A1 in the Vietnam War era.

Chief warrant officer: Chief Warrant Officer is a military rank used by the United States Armed Forces, the Canadian Armed Forces, the Pakistan Air Force, the Israel Defense Forces, the South African National Defence Force, the Lebanese Armed Forces and, since 2012, the Singapore Armed Forces.  In the United States Armed Forces Chief Warrant Officers are actual officers, not NCOs like other NATO forces.

Military history of Jewish Americans: Jewish Americans have served in the United States armed forces dating back to before the colonial era, when Jews had served in militias of the Thirteen Colonies.  Jewish military personnel have served in all branches of the armed forces and in every major armed conflict to which the United States has been involved.  The Jewish Chaplains Council estimated that there are currently 10,000 known Jewish servicemen and servicewomen on active duty.  As of 2011, Jews made up around 0.3% of the total number of those serving in the armed forces.

United States Armed Forces Chess: United States Armed Forces Chess refers to the annual Armed Forces Chess Championship held annually since 1960 by the United States Department of Defense and the United States Chess Federation.  It also refers to the study of the game of chess by the United States Armed Forces for military applications.

Iver Johnson: Iver Johnson was a U.S. firearms, bicycle, and motorcycle manufacturer from 1871 to 1993.  The company shared the same name as its founder, Norwegian-born Iver Johnson (1841–1895).  After closing, the name was resold and in 2006 Iver Johnson Arms opened in Rockledge, Florida selling shotguns and M1911 pistols. However, the new Iver Johnson company does not have any parts, guns or information relating to the pre-1993 company, and represents a continuation of it in name only.

U.S.–Japan Status of Forces Agreement: U.S.–Japan Status of Forces Agreement (formally, the "Agreement under Article VI of the Treaty of Mutual Cooperation and Security between Japan and the United States of America, Regarding Facilities and Areas and the Status of United States Armed Forces in Japan") is an agreement between Japan and the United States signed on 19 January 1960 in Washington, the same day as the revised U.S.-Japan Security Treaty.  It is a status of forces agreement (SOFA) as stipulated in article VI of that treaty, which referred to "a separate agreement" governing the "use of [...] facilities and areas [granted to the U.S.] as well as the status of United States armed forces in Japan".  It replaced the earlier "U.S.-Japan Administrative Agreement" that governed such issues under the original 1951 security treaty.

Vietnam Service Medal: The Vietnam Service Medal is a military award of the United States Armed Forces established on 8 July 1965 by order of President Lyndon B. Johnson.  The medal is awarded to recognize service during the Vietnam War by all members of the United States Armed Forces provided they meet the award requirements.

United States Air Force: The United States Air Force (USAF) is the aerial and space warfare service branch of the United States Armed Forces and one of the seven American uniformed services.  Initially part of the United States Army, the USAF was formed as a separate branch of the U.S. Armed Forces on 18 September 1947 under the National Security Act of 1947.  It is the most recent branch of the U.S. Armed Forces to be formed.  The USAF is the largest and one of the most technologically advanced air forces in the world.  The service articulates its core functions as Nuclear Deterrence Operations, Air Superiority, Space Superiority, Cyberspace Superiority, Command and Control, Global Integrated ISR, Global Precision Attack, Special Operations, Rapid Global Mobility, Personnel Recovery, Agile Combat Support, and Building Partnerships.

Supporting paragraphs: Iver Johnson M1911 pistol
Answer: 2006