The United States Naval Observatory began the A. 1 scale 13 September 1956, using an Atomichron commercial atomic clock, followed by the NBS-A scale at the National Bureau of Standards, Boulder, Colorado.

" It was introduced in September 1956.

The Silver Age of comic books is generally considered to date from the first successful revival of the dormant superhero form — the debut of Robert Kanigher and Carmine Infantino's Flash in Showcase No. 4 ( September / October 1956 ).

Controversy surrounds Harold Macmillan, who met with Eisenhower on September 25, 1956, then relayed to Prime Minister Anthony Eden the false impression that Eisenhower promised to support an invasion.

However, Presley became too big a name to ignore, and Sullivan scheduled him to appear on September 9, 1956.

* 1956 – Betty Ong, Flight attendant of American Airlines Flight 11 on September 11, 2001 ( d. 2001 )

Frederick Soddy ( 2 September 1877 – 22 September 1956 ) was an English radiochemist and monetary economist who explained, with Ernest Rutherford, that radioactivity is due to the transmutation of elements, now known to involve nuclear reactions.

* Nichols, Roy F. “ The Kansas-Nebraska Act: A Century of Historiography .” Mississippi Valley Historical Review 43 ( September 1956 ): 187-212.

Planning for his enlistment, the family returned to Fort Worth in July 1956, and he re-enrolled in 10th grade for the September session at Arlington Heights High School in Fort Worth, but quit in October to join the Marines ( see below ); he never received a high school diploma.

* Togoland was split into British Togoland ( under an Administrator, a post filled by the colonial Governor of the British Gold Coast ( present Ghana ) except 30 September 1920 – 11 October 1923 Francis Walter Fillon Jackson ) and French Togoland ( under a Commissioner ) ( United Kingdom and France ), 20 July 1922 separate Mandates, transformed on 13 December 1946 into United Nations trust territories, French Togo Associated Territory ( under a Commissioner till 30 August 1956, then under a High Commissioner as Autonomous Republic of Togo ) and British Togoland ( as before ; on 13 December 1956 it ceased to exist as it became part of Ghana )

Michael George Francis Ventris, OBE ( 12 July 1922 – 6 September 1956 ) was an English architect who, along with John Chadwick and Alice Kober, deciphered Linear B, a previously unknown ancient script discovered at Knossos by Arthur Evans.

Diplomatic relations were established in September 1956.

On September 21, 1956, Rigoberto López Pérez, sneaked into a party attended by the President and shot him in the chest.

Luis Somoza Debayle became President ( 29 September 1956 to 1 May 1963 ), and was effectively dictator of the country until his death, but his brother Anastasio Somoza Debayle held great power as head of the National Guard.

It was inaugurated on September 25, 1956, initially carrying 36 telephone channels.

Opened on September 25, 1956, TAT-1 carried 588 London-US calls and 119 London-Canada calls in the first 24 hours of public service.

Urho Kaleva Kekkonen (; 3 September 1900-31 August 1986 ), was a Finnish politician who served as Prime Minister of Finland ( 1950 – 1953, 1954 – 1956 ) and later as the eighth and longest-serving President of Finland ( 1956 – 1982 ).

Nixon was also the first Vice President to assume temporary control of the executive branch, which he did after Eisenhower suffered a heart attack on September 24, 1955, ileitis in June 1956, and a stroke in November 1957.

* September 21 – Preston Tucker, American automobile designer ( d. 1956 )

* September 12 – Lou Moore, American race car driver and team owner ( d. 1956 )

* September 12 – Irene Joliot-Curie, French physicist, recipient of the Nobel Prize in Chemistry ( d. 1956 )

* September 5 – Wilhelm Ritter von Leeb, German field marshal ( d. 1956 )

On September 12, 2002, Defense Secretary Donald Rumsfeld and General Richard Myers, Chairman of the Joint Chiefs of Staff, dedicated the Victims of Terrorist Attack on the Pentagon Memorial at Arlington National Cemetery.

Lord Sydney, as Secretary of State for the Home Office, was the minister in charge of this undertaking, and in September 1786 he appointed Phillip commodore of the fleet which was to transport the convicts and soldiers who were to be the new settlers to Botany Bay.

Because of the increasing costs of food imports to avoid mass-starvation in Germany, and with the danger of losing the entire nation to communism, the U. S. government abandoned the Morgenthau plan in September 1946 with Secretary of State James F. Byrnes ' speech Restatement of Policy on Germany.

* Speech by James F. Byrnes, United States Secretary of State " Restatement of Policy on Germany " Stuttgart September 6, 1946.

Former President César Gaviria became Secretary General of the OAS in September 1994 and was reelected in 1999.

In September 1953, the Central Committee bestowed Khrushchev with the title of First Secretary, which made his seniority in the Central Committee official.

* 1969 – United States Secretary of State William P. Rogers proposes his plan for a ceasefire in the War of Attrition ; Egypt and Jordan accept it over the objections of the PLO, which leads to civil war in Jordan in September 1970.

President Barack Obama, Secretary of Defense Leon Panetta, and Chairman of the Joint Chiefs of Staff Admiral Mike Mullen, sent that certification to Congress on July 22, 2011, which set the end of DADT for September 20, 2011.

In September 2002, Secretary of State Colin Powell made a brief but historic visit to Gabon to highlight environmental protection and conservation in the Central Africa region.

* Spellings, Margaret, " A Test of Leadership: Charting the Future of U. S. Higher Education ", A Report of the Commission Appointed by Secretary of Education Margaret Spellings, September 2006.

The war went very badly, and when the British burned the capitol building on August 24, 1814, Madison removed John Armstrong as Secretary of War and turned to Monroe for help, appointing him Secretary of War on September 27.

On September 17, Walker resigned as Secretary of War ; Benjamin left the Attorney General position replace Walker, and Thomas Bragg of North Carolina ( brother of General Braxton Bragg ) took Benjamin ’ s place as Attorney General.

Konstantin Ustinovich Chernenko ( 24 September 1911 – 10 March 1985 ) was a Soviet politician and the fifth General Secretary of the Communist Party of the Soviet Union.

In September 2000, the Louvre Museum dedicated the Gilbert Chagoury and Rose-Marie Chagoury Gallery to display tapestries donated by the Chagourys, including a 16th-century six-part tapestry suite, sewn with gold and silver threads representing sea divinities, which was commissioned in Paris for Colbert de Seignelay, Secretary of State for the Navy.

In September 2008, US Secretary of State Condoleezza Rice met with Gaddafi and announced that US-Libya relations have entered a ' new phase '.

As the situation in Europe escalated into war, the Assembly transferred enough power to the Secretary General on 30 September 1938 and 14 December 1939 to allow the League to continue to exist legally and carry on reduced operations.

In addition, the NTSB has assisted the National Aeronautics and Space Administration in its investigations of both the Challenger and the Columbia space shuttle disasters, assisted the Department of Justice during the September 11, 2001 terrorist attack investigations, and assisted the U. S. military in its investigation of the aircraft that crashed in the former Yugoslavia that took the lives of more than 30 Americans, including Commerce Secretary Ron Brown.

The removal of Shanghai Municipality Party Secretary Chen Liangyu in September 2006 is the latest example.

In his speech " Restatement of Policy on Germany ", made in Stuttgart on September 6, 1946, United States Secretary of State James F. Byrnes stated the U. S. motive in detaching the Saar from Germany: " The United States does not feel that it can deny to France, which has been invaded three times by Germany in 70 years, its claim to the Saar territory ".

* briefing by Defense Secretary Donald Rumsfeld, 19 September 2001

On September 29, 1789, President Washington appointed Thomas Jefferson of Virginia, then Minister to France, to be the first United States Secretary of State.

The act, as a response to the terrorist attacks of September 11th, significantly reduced restrictions in law enforcement agencies ' gathering of intelligence within the United States ; expanded the Secretary of the Treasury ’ s authority to regulate financial transactions, particularly those involving foreign individuals and entities ; and broadened the discretion of law enforcement and immigration authorities in detaining and deporting immigrants suspected of terrorism-related acts.

After Imperial Commissioner Lin Zexu confiscated 20, 000 cases of British-owned opium in 1839, Jardine arrived in London in September, and pressed Foreign Secretary Lord Palmerston for a forceful response.

* September 5 – Dulce Saguisag, Filipino politician and former DSWD Secretary.