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1968 Thule Air Base B-52 Crash
On 21 January 1968, an aircraft accident, sometimes known as the Thule affair or Thule accident (; ), involving a United States Air Force (USAF) Boeing B-52 Stratofortress, B-52 bomber occurred near Thule Air Base in the Danish territory of Greenland. The aircraft was carrying four B28 nuclear bomb, B28FI thermonuclear bombs on a Cold War "Operation Chrome Dome, Chrome Dome" alert mission over Baffin Bay when a cabin fire forced the crew to abandon the aircraft before they could carry out an emergency landing at Thule Air Base. Six crew members ejected safely, but one who did not have an ejection seat was killed while trying to bail out. The bomber crashed onto sea ice in North Star Bay, Greenland, causing the conventional explosives aboard to detonate and the nuclear payload to rupture and disperse, resulting in radioactive contamination of the area. The United States and Denmark launched an intensive clean-up and recovery operation, but the Teller–Ulam design#Basic principle ...
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In-flight Fire
In aviation, an in-flight fire is a type of aviation accident where an aircraft catches on fire in-flight. They are considered one of the most dangerous hazards in aviation, with a report from the British Civil Aviation Authority (United Kingdom), Civil Aviation Authority showing that after a fire on an aircraft starts, flight crews only have on average 17 minutes to land their aircraft before it becomes loss of control (aeronautics), uncontrollable. Between 1981 and 1990, approximately 20% of all fatalities on US airlines were caused by in-flight fires. Types *Cabin fire – A fire in the Fixed-wing aircraft#Fuselage, passenger cabin. **Includes related areas like lavatories, galley (kitchen), galleys, overhead compartments, and items on passengers. *Cargo fire – A fire inside the air cargo, cargo hold. *Cockpit fire – A fire in the cockpit. *Electrical fire – A fire occurring from electrical wires or other electrical systems. *Engine fire – A fire inside of an aircraf ...
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Sea Ice
Sea ice arises as seawater freezes. Because ice is less density, dense than water, it floats on the ocean's surface (as does fresh water ice). Sea ice covers about 7% of the Earth's surface and about 12% of the world's oceans. Much of the world's sea ice is enclosed within the polar ice packs in the Earth's polar regions: the Arctic ice pack of the Arctic Ocean and the Antarctic ice pack of the Southern Ocean. Polar packs undergo a significant yearly cycling in surface extent, a natural process upon which depends the Arctic ecology, including the Arctic sea ice ecology and history, ocean's ecosystems. Due to the action of winds, currents and temperature fluctuations, sea ice is very dynamic, leading to a wide variety of ice types and features. Sea ice may be contrasted with icebergs, which are chunks of ice shelf, ice shelves or glaciers that Ice calving, calve into the ocean. Depending on location, sea ice expanses may also incorporate icebergs. General features and dynamics ...
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Robert McNamara
Robert Strange McNamara (; June 9, 1916 – July 6, 2009) was an American businessman and government official who served as the eighth United States secretary of defense from 1961 to 1968 under presidents John F. Kennedy and Lyndon B. Johnson at the height of the Cold War. He remains the longest-serving secretary of defense, having remained in office over seven years. He played a major role in promoting the U.S. involvement in the #Vietnam War, Vietnam War. McNamara was responsible for the institution of #Systems analysis, systems analysis in public policy, which developed into the discipline known today as policy analysis. McNamara graduated from the University of California, Berkeley and Harvard Business School. He served in the United States Army Air Forces during World War II. After World War II, Henry Ford II hired McNamara and a group of other Army Air Force veterans to work for #Ford Motor Company, Ford Motor Company, reforming Ford with modern planning, organization, an ...
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Holding (aeronautics)
In aviation, holding (or flying a hold) is a maneuver designed to delay an aircraft already in flight while keeping it within a specified airspace; i.e. "going in circles." Implementation A holding pattern for instrument flight rules (IFR) aircraft is usually a racetrack pattern based on a ''holding fix''. This ''fix'' can be a radio beacon such as a non-directional beacon (NDB) or VHF omnidirectional range (VOR). The fix is the start of the first turn of the racetrack pattern. Aircraft will fly towards the fix, and once there will enter a predefined racetrack pattern. A standard holding pattern uses right-hand turns and takes approximately 4 minutes to complete (one minute for each 180-degree turn, and two one-minute straight ahead sections). Deviations from this pattern can happen if long delays are expected; longer legs (usually two or three minutes) may be used, or aircraft with distance measuring equipment (DME) may be assigned patterns with legs defined in nautical ...
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Waypoint
A waypoint is a point or place on a route or line of travel, a stopping point, an intermediate point, or point at which course is changed, the first use of the term tracing to 1880. In modern terms, it most often refers to coordinates which specify one's position on the globe at the end of each "leg" (stage) of a journey. Hence, the term connotes a reference point in physical space, most often associated with navigation. For example, in the case of sea navigation, a waypoint could mark the longitudinal and latitudinal coordinate or a GPS point in open water, a location near a known mapped shoal or other entity in a body of water, a point a fixed distance off of a geographical entity such as a lighthouse or harbour entrance, etc. In air navigation, waypoints most often consist of a series of abstract GPS points that create artificial airways—"highways in the sky"—created specifically for purposes of air navigation that have no clear connection to features of the real world. ...
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North American Aerospace Defense Command
North American Aerospace Defense Command (NORAD ; , CDAAN), known until March 1981 as the North American Air Defense Command, is a Combined operations, combined organization of the United States and Canada that provides aerospace warning, air sovereignty, and protection for Canada and the continental United States. Headquarters for NORAD and the NORAD/United States Northern Command (USNORTHCOM) center are located at Peterson Space Force Base in El Paso County, Colorado, El Paso County, near Colorado Springs, Colorado. The nearby Cheyenne Mountain Complex has the Alternate Command Center. The Commander of the North American Aerospace Defense Command, NORAD commander and deputy commander are, respectively, a General (United States), United States four-star general or equivalent and a Lieutenant-general (Canada), Canadian lieutenant-general or equivalent. Command NORAD is headed by its Commander of NORAD, commander, who is a Four-star rank, four-star General (United States), ...
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Ballistic Missile Early Warning System
The RCA 474L Ballistic Missile Early Warning System (BMEWS, 474L System, Project 474L) was a United States Air Force Cold War early warning radar, computer, and communications system, for ballistic missile detection. The network of twelve radars, which was constructed beginning in 1958 and became operational in 1961, was built to detect a mass ballistic missile attack launched on northern approaches or15 to 25 minutes' warning time also provided Project Space Track satellite data (e.g., about one-quarter of SPADATS observations). It was replaced by the Solid State Phased Array Radar System in 2001. Background The Ballistic Missile Early Warning System (BMEWS) was a radar system built by the United States (with the cooperation of Canada and Denmark on whose territory some of the radars were sited) during the Cold War to give early warning of a Soviet intercontinental ballistic missile (ICBM) nuclear strike, to allow time for US bombers to get off the ground and land-based U ...
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Pre-emptive Nuclear Strike
In nuclear strategy, a first strike or preemptive strike is a preemptive surprise attack employing overwhelming force. First strike capability is a country's ability to defeat another nuclear power by destroying its arsenal to the point where the attacking country can survive the weakened retaliation while the opposing side is left unable to continue war. The preferred methodology is to attack the opponent's strategic nuclear weapon facilities (missile silos, submarine bases, bomber airfields), command and control sites, and storage depots first. The strategy is called counterforce. Historical background ''First-strike attack'', the use of a nuclear first strike capability, was greatly feared during the Cold War between NATO and the Soviet Bloc. At various points, fear of a first strike attack existed on both sides. Misunderstood changes in posture and well understood changes in technology used by either side often led to speculation regarding the enemy's intentions. 1948– ...
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Thomas S
Thomas may refer to: People * List of people with given name Thomas * Thomas (name) * Thomas (surname) * Saint Thomas (other) * Thomas Aquinas (1225–1274) Italian Dominican friar, philosopher, and Doctor of the Church * Thomas the Apostle * Thomas (bishop of the East Angles) (fl. 640s–650s), medieval Bishop of the East Angles * Thomas (Archdeacon of Barnstaple) (fl. 1203), Archdeacon of Barnstaple * Thomas, Count of Perche (1195–1217), Count of Perche * Thomas (bishop of Finland) (1248), first known Bishop of Finland * Thomas, Earl of Mar (1330–1377), 14th-century Earl, Aberdeen, Scotland Geography Places in the United States * Thomas, Idaho * Thomas, Illinois * Thomas, Oklahoma * Thomas, Oregon * Thomas, South Dakota * Thomas, Virginia * Thomas, Washington * Thomas, West Virginia * Thomas County (other) * Thomas Township (other) Elsewhere * Thomas Glacier (Greenland) Arts and entertainment * ''Thomas'' (Burton novel), a 1969 ...
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USAF
The United States Air Force (USAF) is the Air force, air service branch of the United States Department of Defense. It is one of the six United States Armed Forces and one of the eight uniformed services of the United States. Tracing its origins to 1 August 1907, as a part of the United States Army Signal Corps, the USAF was established by transfer of personnel from the Army Air Forces with the enactment of the National Security Act of 1947. It is the second youngest branch of the United States Armed Forces and the fourth in United States order of precedence, order of precedence. The United States Air Force articulates its core missions as air supremacy, intelligence, surveillance, target acquisition, and reconnaissance, global integrated intelligence, surveillance and reconnaissance, airlift, rapid global mobility, Strategic bombing, global strike, and command and control. The United States Department of the Air Force, Department of the Air Force, which serves as the USAF's ...
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Thule BMEWS
Thule ( ; also spelled as ''Thylē'') is the most northerly location mentioned in ancient Greek and Roman literature and cartography. First written of by the Greek explorer Pytheas of Massalia (modern-day Marseille, France) in about 320 BC, it was often described by later writers as an island north of Ireland or Britain. Modern interpretations have included Orkney, Shetland, Northern Scotland, the Faroe Islands, and Iceland. Other potential locations are the island of Saaremaa (Ösel) in Estonia, or the Norwegian island of Smøla.Andreas Kleineberg, Christian Marx, Eberhard Knobloch und Dieter Lelgemann: ''Germania und die Insel Thule. Die Entschlüsselung von Ptolemaios' "Atlas der Oikumene".'' Wissenschaftliche Buchgesellschaft, Darmstadt 2010. In classical and medieval literature, ''ultima Thule'' (Latin "farthest Thule") acquired a metaphorical meaning of any distant place located beyond the "borders of the known world". By the Late Middle Ages and the early modern period ...
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Nuclear-free Zone
A nuclear-free zone is an area in which nuclear weapons and nuclear power plants are banned. The specific ramifications of these depend on the locale in question, but are generally distinct from nuclear-weapon-free zones, in that the latter only bans nuclear weapons but may permit nuclear power. Nuclear-free zones usually neither address nor prohibit radiopharmaceuticals used in nuclear medicine even though many of them are produced in nuclear reactors. They typically do not prohibit other nuclear technologies such as cyclotrons used in particle physics. Several sub-national authorities worldwide have declared themselves "nuclear-free". However, the label is often symbolic, as nuclear policy is usually determined and regulated at higher levels of government: nuclear weapons and components may traverse nuclear-free zones via military transport without the knowledge or consent of local authorities which had declared nuclear-free zones. Palau became the first nuclear-free nation in ...
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