Etymology
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Caligula 
cognomen of the mad, extravagant, and legendarily cruel third Roman emperor (12 C.E.-41 C.E.), born Gaius Caesar. The nickname is Latin, literally "little boot," given when he joined his father on military campaigns when still a toddler, in full, child-sized military gear; it is a diminutive of caliga "heavy military shoe," which is of unknown origin.
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Pamplona 

city in Spain, Roman Pompeiopolis, named for Pompey the Great, Roman military leader who founded it 68 B.C.E.

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Mae West 
type of inflatable life jacket, 1940, military slang, in reference to the screen name of the buxom U.S. film star (1892-1980).
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Cossack (n.)

"one of a military people who inhabit the steppes of southern Russia, 1590s, from Russian kozak, from Turkish kazak "adventurer, guerrilla, nomad," from qaz "to wander." The same Turkic root is the source of the people-name Kazakh and the nation of Kazakhstan.

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Flynn 
surname, from Irish flann "red." Rhyming phrase in like Flynn is 1940s slang, said to have originated in the U.S. military, perhaps from alleged sexual exploits of Hollywood actor Errol Flynn (1909-1959).
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Koblenz 

also Coblenz, city in Germany, founded by the Romans as a military outpost c. 8 B.C.E., from Latin ad confluentes "at the confluence" (see confluence); so named for its situation at the confluence of the Rhine and Moselle rivers.

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Charlie 

masc. proper name, also Charley, familiar form of Charles (also see -y (3)); 1965 in Vietnam War U.S. military slang for "Vietcong, Vietcong soldier," probably suggested by Victor Charlie, military communication code for V.C. (as abbreviation of Viet Cong), perhaps strengthened by World War II slang use of Charlie for Japanese soldiers, which itself is probably an extension of the 1930s derogatory application of Charlie to any Asian man, from fictional Chinese detective Charlie Chan.

Other applications include "a London night watchman" (1812); "a goatee beard" (1834, from portraits of King Charles I and his contemporaries); "a fox" (1857); in plural "a woman's breasts" (1874); "an infantryman's pack" (World War I); and "a white man" (Mr. Charlie), 1960, American English, from African-American vernacular.

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Bonaparte 

in reference to Napoleon Bonaparte (1769-1821), Corsican-born French military leader and dictator; the surname is the French form of Italian Buonaparte, from buona "good" (from Latin bonus "good;" see bonus) + parte "part, share, portion" (from Latin partem "a part, piece, a share, a division," from PIE root *pere- (2) "to grant, allot"). Related: Bonapartist; Bonapartism.

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Brandenburg 
region in northeastern Germany, traditionally said to be ultimately from Slavic, but perhaps German and meaning literally "burned fortress," or else from a Celtic proper name. In reference to a kind of ornamental button with loops, worn on the front of men's coats, by 1753, probably from Prussian military uniforms; later extended to ornamental buttons on women's dress (1873).
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Kilroy 
U.S. military graffito character, 1945, said to be either Sgt. Francis J. Kilroy Jr., U.S. Army Air Transport, whose friend or friends began writing his name everywhere as a prank; or war materiéls inspector James J. Kilroy of Quincy, Mass., who wrote "Kilroy was here" on everything he checked.
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