All articles starting with U
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United States national missile defense
The United States national missile defense is the homeland defense system built to intercept a limited attack by intercontinental ballistic missiles, centered on Ground-based Midcourse Defense in Alaska and California.
United States National Radio Quiet Zone
The United States National Radio Quiet Zone (NRQZ) is a 13,000-square-mile area of West Virginia and Virginia, established in 1958 to protect radio astronomy at Green Bank.
United States National Road Race Championships
United States National Road Race Championships (USPRO), USA Cycling's annual road race national titles dating to 1985 (men) and 1966 (women); winners wear the stars-and-stripes jersey; 2026 champions Kate Courtney and Quinn Simmons in Charleston, WV.
United States National Security Council
The United States National Security Council (NSC), created by the National Security Act of 1947, is the President's statutory advisory body integrating domestic, foreign, and military national security policy, with a White House staff led by the National Security Adviser.
United States nationality law
United States nationality law governs who acquires U.S. citizenship at birth (jus soli under the 14th Amendment, jus sanguinis under INA 301), naturalization, dual nationality, and loss of nationality under INA 349.
United States Naval Academy
The United States Naval Academy (USNA) is the federal service academy at Annapolis, Maryland, founded October 10, 1845 by Secretary George Bancroft, that trains and commissions Navy and Marine Corps officers; about 91,000 graduates, 338-acre campus, six-year graduation rate 93%.
United States Naval Aviator training pipeline
The United States Naval Aviator training pipeline is the sequence of selection, ground school, and graded flight training that leads to Wings of Gold, typically over 18 to 24 months.
United States Naval Observatory
The United States Naval Observatory (USNO) is the U.S. Navy's scientific institution for timekeeping and astronomy in Washington, D.C., founded in 1830 and the official source of time for the Department of Defense.
United States naval reactors
United States naval reactors (US naval reactors) are the pressurized-water reactors powering US Navy nuclear submarines and aircraft carriers since USS Nautilus first went underway on nuclear power in 1955.
United States Naval Special Warfare Command
The United States Naval Special Warfare Command (NAVSPECWARCOM), established April 16, 1987 at Coronado, California, is the Navy component of USSOCOM, commanding SEALs and SWCC for maritime special operations.
United States Naval Test Pilot School
The United States Naval Test Pilot School (USNTPS) is a U.S. Navy school founded in 1945 in Maryland, recognized for its unique rotary-wing and airborne systems curriculum.
United States Navy
The United States Navy, also known as the US Navy, is the naval warfare service branch of the US Armed Forces, with origins in the Continental Congress of 1775.
United States Navy aircraft squadron designation and lineage
The United States Navy aircraft squadron designation and lineage system assigns letter-number designations like VF and VFA, with lineage rules set by Navy policy since 1922.
United States Navy in World War II
The United States Navy in World War II fought Japan in the Pacific and U-boats in the Atlantic, 1941-1945. Key facts: 56,206 dead, fast carrier task forces, 52 submarines lost, Leyte Gulf.
United States Navy Judge Advocate General's Corps
United States Navy Judge Advocate General's Corps (Navy JAG Corps): the Navy's uniformed legal corps of over 1,000 judge advocates, tracing to the 1865 Solicitor and Naval Judge Advocate General Act, serving Navy and Marine Corps commands worldwide.
United States Navy officer rank insignia
United States Navy officer rank insignia: gold sleeve stripes, shoulder-board stripes, and collar pins marking Ensign through Fleet Admiral (O-1 to O-11) and warrant officers WO1 to CWO5, with the line officer's star and staff corps devices.
United States Navy Reserve
United States Navy Reserve (USNR), the Navy's reserve component of Citizen Sailors, established March 3, 1915; about 57,500 authorized Selected Reservists and TAR personnel providing strategic depth and mobilization surge capacity.
United States Navy reserve fleets
United States Navy reserve fleets: inactive Navy warships preserved for reactivation, plus MARAD's National Defense Reserve Fleet of about 100 vessels and its Ready Reserve Force of surge sealift ships ready in 5 to 10 days.
United States Navy SEAL selection and training
US Navy SEAL selection and training: BUD/S at Coronado plus NSW Prep and SQT, six months of BUD/S, Hell Week, 70-85% BUD/S attrition, about 9.5% full-pipeline graduation to the Trident.
United States Navy SEALs
United States Navy SEALs, the Navy's sea-air-land special operations force, descended from WWII Scouts and Raiders and Underwater Demolition Teams, were established as SEAL Team One in December 1961, and are organized under Naval Special Warfare Command at Coronado.
United States Navy ships
United States Navy ships are the warships, submarines, and support vessels the Navy organizes into hull-numbered classes, from nuclear carriers to USS Constitution, the world's oldest commissioned warship afloat.
United States Navy Strike Fighter Tactics Instructor program
The Navy Strike Fighter Tactics Instructor program, known as TOPGUN, is the Navy Fighter Weapons School's graduate-level air combat course, founded in 1969 after the Ault Report to fix Vietnam-era kill ratios, now at NAS Fallon within NAWDC.
United States Newspaper Program
United States Newspaper Program (USNP), 1982–2011 NEH-Library of Congress cooperative effort locating, cataloging, and microfilming US newspapers; over 140,000 records in WorldCat; succeeded by NDNP and Chronicling America.
United States non-interventionism
United States non-interventionism: a foreign policy tradition, rooted in Washington's 1796 Farewell Address and the Monroe Doctrine, opposing military alliances and foreign wars; seen in the interwar Neutrality Acts and modern America First politics, distinct from isolationism.
United States Northern Command
United States Northern Command (USNORTHCOM), a DOD unified combatant command created October 1, 2002, conducts homeland defense and civil support across the continental United States, Alaska, Canada, Mexico, and Greenland; its commander is dual-hatted with NORAD.
United States Note
The United States Note, also called the Legal Tender Note, was paper currency issued directly by the U.S. Treasury from 1862 until 1971, distinguished by its red seal.
United States Nuclear Regulatory Commission
The United States Nuclear Regulatory Commission (NRC) is an independent federal agency that licenses and regulates civilian nuclear reactors and radioactive materials to protect public health and safety.
United States Numbered Highway System
The United States Numbered Highway System, also called U.S. Highways, is a national road network adopted in 1926, numbered with even routes east-west and odd routes north-south.
United States occupation of Haiti
The United States occupation of Haiti (1915–1934), a nineteen-year Marine occupation begun after President Vilbrun Guillaume Sam's assassination, governed Haitian finances and security under the 1915 Haitian-American Treaty, suppressed the caco rebellion, and ended under Roosevelt's Good Neighbor Policy.
United States occupation of Nicaragua
United States occupation of Nicaragua (1912-1933), also called the Nicaraguan Campaign: U.S. Marine occupation begun under Adolfo Díaz against Luis Mena's revolt, marked by dollar diplomacy, the 1916 quasi-protectorate, supervised elections, the Guardia Nacional, and the Sandino counterinsurgency.