Paramilitary policemen take part in a summer training in Shenzhen, Guangdong province, China, June 27, 2016. (Photo by Reuters/China Daily)

A recruitment drive during the First World War at Trafalgar Square, London. (Photo by Central Press/Getty Images)

German field telegraph operators at work in Warsaw. (Photo by Hulton Archive/Getty Images). 1st October 1914

German flying ace Baron Manfred von Richthofen (1892–1918) also known as The Red Baron with his dog Moritz, circa 1916.

U.S. Marines kick in a door while securing a building next to the main hospital in central Baghdad April 15, 2003, which will be used as a temporary Iraqi police headquarters. (Photo by Jerry Lampen/Reuters)

Street fighting in Berlin between Government troops and Spartacists, during the Spartacist uprising which followed Germany's defeat in World War I. (Photo by Keystone/Getty Images). 1919

“The Falklands War, also known as the Falklands Conflict or Falklands Crisis, was a 1982 limited war between Argentina and the United Kingdom. The conflict resulted from the long-standing dispute over the sovereignty of the Falkland Islands and South Georgia and the South Sandwich Islands, which lie in the South Atlantic east of Argentina”. – Wikipedia

Photo: Kenneth “Rocky” Hudson, a Petty Officer from Gosport aboard HMS Hermes, the flagship of the Royal Navy, heading for the Falkland Islands. The troops are waging a Mexican moustache growing contest and Kenneth is wearing 30mm cannon shells slung around his body and sporting a fat cigar. (Photo by Fox Photos/Getty Images). 18th April 1982

A U.S. Marine leads training on a shooting range in France in an undated photo taken during the First World War. (Photo by Reuters/Courtesy Library of Congress)