Missiles ( see rocket and missile system), which are unpiloted, rocket- or jet-powered delivery systems for munitions, have assumed an important role in military strategy and tactics. Although most aircraft companies engage in UAV manufacture, Northrop Grumman and Raytheon in the United States and Israel Aircraft Industries have specialized in this area and are major suppliers to many national defense agencies. A subclass of UAVs, often remotely piloted and sometimes called drones, are used as aerial targets for fighters and antiaircraft weapons. Carrying sensors for surveillance, they are designed to fly either for long duration at very high altitudes or for shorter periods at low altitudes and to transmit their acquired data to orbiting satellites. Uncrewed aerial vehicles (UAVs), a class of aircraft akin to radio-controlled models and cruise missiles, have become significant factors in military reconnaissance. A large number of helicopters are sold by the American producer Robinson, which builds low-cost, relatively unsophisticated training and light-use vehicles. Other major helicopter makers are Agusta of Italy (subsidiary of Finmeccanica) and Westland of Great Britain as well as Kamov and Mil of Russia. France’s Aerospatiale and Germany’s Daimler-Benz Aerospace (later DaimlerChrysler Aerospace) combined their helicopter activities as Eurocopter. Sikorsky (part of United Technologies), Bell Helicopter Textron, and Boeing have their facilities in the United States. Seven Western and two Russian manufacturers produce most of the world’s large military and civil helicopters. Short-distance personnel transportation, construction, police work, and traffic and event monitoring by the media dominate civilian uses. Combat helicopters are designed by manufacturers specifically for that military purpose, whereas helicopters for transportation frequently exist in both civil and military variants. Military models are of two kinds-combat and transport. Helicopters occupy important niches in both military and civil aviation. SpaceNext50 Britannica presents SpaceNext50, From the race to the Moon to space stewardship, we explore a wide range of subjects that feed our curiosity about space!.Learn about the major environmental problems facing our planet and what can be done about them! Saving Earth Britannica Presents Earth’s To-Do List for the 21st Century.Britannica Beyond We’ve created a new place where questions are at the center of learning.100 Women Britannica celebrates the centennial of the Nineteenth Amendment, highlighting suffragists and history-making politicians.COVID-19 Portal While this global health crisis continues to evolve, it can be useful to look to past pandemics to better understand how to respond today.Student Portal Britannica is the ultimate student resource for key school subjects like history, government, literature, and more.Britannica Explains In these videos, Britannica explains a variety of topics and answers frequently asked questions.Demystified Videos In Demystified, Britannica has all the answers to your burning questions.This Time in History In these videos, find out what happened this month (or any month!) in history.#WTFact Videos In #WTFact Britannica shares some of the most bizarre facts we can find.Britannica Classics Check out these retro videos from Encyclopedia Britannica’s archives.
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