Editing Blue (section)

=== Uniforms ===
<gallery mode="packed" heights="180">
File:HoratioNelson1.jpg|[[Navy blue]] derives its name from the uniform of [[Royal Navy]] officers
File:TSA agents, ca. 2016.jpg|[[Transportation Security Administration]] agents
File:2010. Донецк. Карнавал на день города 010.jpg|Ukrainian police officer in Donetsk
File:PM do Rio muda o comando de 25 UPPs.jpg|Officers of the [[Military Police of Rio de Janeiro State]], Brazil
</gallery>
In the 17th century. The Prince-Elector of Brandenburg, [[Frederick William I of Prussia]], chose [[Prussian blue]] as the new colour of Prussian military uniforms, because it was made with [[Woad]], a local crop, rather than [[Indigo]], which was produced by the colonies of Brandenburg's rival, England. It was worn by the German army until World War I, with the exception of the soldiers of Bavaria, who wore sky-blue.<ref>Heller (2010) p.31</ref>

In 1748, the [[Royal Navy]] adopted a dark shade of blue for the uniform of officers.<ref name="p32">Heller (2010) p.32</ref> It was first known as marine blue, now known as [[navy blue]].<ref>J.R. Hill, ''The Oxford Illustrated History of the Royal Navy'', Oxford University Press, 1995.</ref> The militia organized by [[George Washington]] selected blue and [[Buff (colour)|buff]], the colours of the British [[Whig (British political party)|Whig Party]]. Blue continued to be the colour of the field uniform of the US Army until 1902, and is still the colour of the dress uniform.<ref>{{Cite web |last=Walter H. Bradford |title=Wearing Army Blue: a 200-year Tradition |url=http://www.army.mil/symbols/uniforms/history.html  |archive-url=https://web.archive.org/web/20141119095538/http://www.army.mil/symbols/uniforms/history.html |archive-date=19 November 2014 |website=army.mil}}</ref>

In the 19th century, police in the United Kingdom, including the [[Metropolitan Police]] and the [[City of London Police]] also adopted a navy blue uniform. Similar traditions were embraced in France and Austria.<ref>Jean Tulard, Jean-François Fayard, Alfred Fierro, ''Histoire et dictionnaire de la Révolution française'', 1789–1799, Éditions Robert Laffont, collection Bouquins, Paris, 1987. {{ISBN|2-7028-2076-X}}</ref> It was also adopted at about the same time for the uniforms of the officers of the [[New York City Police Department]].<ref name="p32" />