A line of soldiers firing handguns during a training session, circa 1920. (Photo by Keystone)

A line of female police officers take aim during a target practice session. French police auxiliaries from the “Prefecture de Police de Paris”, Paris, France, circa 1965. (Photo by Keystone)

A squad of Marshal Sun's shock troops armed with Mauser pistols during training at Shanghai during civil war in China, 1927.

A “policeman” and a “gangster” shoot it out in the streets of London during a demonstration of a new eight-cyclinder saloon car with bulletproof windows and pivot holes for guns. The car is being tested by officials at the Criminal Investigation Department of Scotland Yard. 15th January 1937. (Photo by J. A. Hampton/Topical Press Agency)

German civilians in Brussels crouch in a doorway with revolvers at the ready as they prepare to resist the British who are recapturing the city. 7th September 1944. (Photo by PNA Rota)

A detachment of soldiers stationed in the Home Counties undergoing revolver training in suburbia. UK, 29th September 1939. (Photo by Reg Speller/Fox Photos)

A young boy looks down the sights of a revolver, January 1958. (Photo by R. Mathews/BIPs)

Female police recruit Aziza Ali, 30, aims her Glock 9mm pistol at a target on the gunnery range at the law enforcement academy July 18, 2004 in Baghdad, Iraq. (Photo by Wathiq Khuzaie)

A young girl is taught how to aim a pistol by a police officer during the a Police Open Day at Shenzhen Police Training School on October 14, 2006 in Shenzhen, China. The event, displaying the latest equipment used by the police is held annually to improve the police's image and help to publicise security knowledge. (Photo by China Photos)

Dressed for deepest Africa and wearing a solar topee, Mrs. T. G. Glover takes aim with her revolver in the Botanic Gardens at Kew, London. 2nd February 1931. (Photo by Fox Photos)

Two women members of the police department in Pasadena, California, showing remarkable aptitude with the revolver under the instruction of Sergeant Bailey, circa 1935. (Photo by General Photographic Agency)

Lola Medina demonstrates the effects of handling a pair of pistols at Centre Firearms, a manufacturer of fake weapons for use in showbusiness, circa 1955. (Photo by Vecchio/Three Lions)

French riot police of the Gendarmerie Nationale are trained in the use of firearms at a school in Chaumont en Bassigny, eastern France. 1st November 1968. (Photo by Reg Lancaster/Express)

Two policemen pursue the members of a New York street gang after a fight broke out, November 1961. (Photo by Perry H. Kretz/Keystone Features)

Members of the Nore Command of the Royal Navy taking part in the Nore Command Rifle and Revolver Meeting at Bartons Point Naval Range, Sheerness, Kent, 5th April 1935. (Photo by A. R. Tanner/Fox Photos)

Etonian Lord Rollo Fielding, son of the Earl of Denbigh, wears a holster during pistol practice with TV star Hugh O'Brien, who stars in the hit series “Wyatt Earp”. 21st January 1959. (Photo by Keystone)

Two middle-aged women and one younger woman aim revolvers at a target in a indoor shooting range in Dearborn, Michigan, 1967 or 1968. (Photo by London Daily Express)

Soldiers of the Royal Norfolk Regiment at Aldershot, Hampshire getting used to revolver shooting while wearing a gas mask. UK, 28th March 1936. (Photo by Reg Speller/Fox Photos)

Tokyo policewoman Haruko Tanaka of the Asakusa ward aims her gun during shooting practice, circa 1955. (Photo by Evans/Three Lions)

Following the Munich massacre at the Olympic Games, a sharpshooting training scheme has been introduced for special policemen. Officers from the Bonn sharpshooting group practice on the shooting range. 13th December 1972. (Photo by Keystone)

A driver vents his anger at fellow motorists by shooting them with a water pistol. 15th December 1966. (Photo by Charles Black/BIPs)

A young boy wearing an Indian headdress hides in a coal hole and takes aim with a toy pistol, London, 7th August 1954. (Photo by Thurston Hopkins/Picture Post)

Mrs. Lee Rothan stands in a pistol-firing stance, early 20th Century (circa 1918). Rothan, of Houston, Texas, was one of the best amateur shooters in the South. (Photo by Keystone)