Military aircraft
Lighter-than-air

In 1783, when the first practical aircraft (hot-air and hydrogen balloons) were established, they were quickly adopted for military duties. The first military balloon unit was the French Aerostatic Corps, who in 1794 flew an observation balloon during the Battle of Fleurus, the first major battle to feature aerial observation. Balloons continued to be used throughout the 19th century, including in the Napoleonic Wars and the Franco-Prussian War, for observation and propaganda distribution. During World War I, German Zeppelin airships carried out multiple air raids on British cities, as well as being used for observation. In the 1920s, the U.S. Navy acquired several non-rigid airships, the first one to see service being the K-1 in 1931. Use by the U.S. as well as other countries continued into World War II. The U.S. Navy retired its last balloons in 1963. Only a handful of lighter-than-air military aircraft were used since, such as the American Blimp MZ-3, used for research and development by the U.S. Navy from 2006 to 2017.
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