Soldier boys at Fort Dix, N.J., learn something about guns during their working hours, as they show their girlfriends at a camp dance, December 13, 1940. In front row, playing with the coin amusement gun, from left: Pvt. Tom D'Amato of West Orange; Rose Sinkewicz, behind gun site, of Trenton; Julia Ivans of Trenton, and Pvt. Vernon Landers of Kearney. Back row: Pvts. William Sargent and William Corlies of Philadelphia. (Photo by AP Photo)

Syrian refugee and Olympic swimmer Yusra Mardini is pictured during a training session in a pool at the Olympic park in Berlin, Germany on April 26, 2018. (Photo by Fabrizio Bensch/Reuters)

A handout photo made available by Limex Images of Pete McLeod of Canada (R) and Kirby Chambliss of the United States flying over the city of Kazan prior to the fifth stage of the Red Bull Air Race World Championship in Russia on August 22, 2018. (Photo by Joerg Mitter/EPA/EFE/Limex Images)

Police are highly visible at the Notting Hill carnival with several arrests, stop and search and a “knife detection gate” in operation, August 27, 2018 in west London, England. 133 arrests were made at the carnival yesterday with 20 knives seized. (Photo by South West News Service/Action Press/Picturedesk)

Animal rights activists protest against the use of animal leather in fashion businness, a few days before the fashion week opening in Milan, Italy, 16 September 2018. (Photo by Matteo Bazzi/EPA/EFE)

Venezuelan migrant and rap singer, Alfonso Mendoza aka “Alca”, 25, practice with his skateboard in a park in Barranquilla, Colombia on September 28, 2018. Alca -who arrived in Colombia nine months ago due to the crisis in his country- was born without legs and changed the wheelchair for a skateboard. At present, he is an example of overcoming adversity, practicing extreme sports, singing rap and giving conferences to young people in vulnerable situations. (Photo by Raul Arboleda/AFP Photo)

A member of the Pakistani Anti-Narcotic Force (ANF) takes a selfie beside a pile of burning drugs and liquor during a ceremony at the Kacha Ghari army firing range, on the outskirts of Peshawar on October 16, 2018, after the contraband was seized in raids across the province. (Photo by Abdul Majeed/AFP Photo)

A reveler performs during the Myths and Legends parade in Medellin, Antioquia department, Colombia on December 8, 2018. (Photo by Joaquín Sarmiento/AFP Photo)