U.S. Air Force wounded warrior, Capt. Sarah Evans, jumps rope in a gym in San Antonio, Texas. Evans was diagnosed with cancer while deployed to Afghanistan and was medically evacuated back to the United States where her leg was amputated. (Photo by Master Sgt. Jeffrey Allen/U.S. Air Force)

The Vietnam Slide Project was created by photo editor Kendra Rennick, who began collecting photo slides after a close friend lost her father, a Vietnam veteran. Her friend found a box of slides that her father had taken while in Vietnam and from there Rennick has continued to collect photographs that Vietnam veterans took during their tours of duty. Here: A photo taken from the collection of D.Thornton, who served in the First Air Cavalry division of the United States Army. (Photo by D.Thornton/The Vietnam Slide Project)

U.S. soldiers from 145th Field Artillery Battalion deployed from the United States fire Paladin self propelled gun during the Foal Eagle training exercise at firing point 180 at the Rodriguez Live Fire Range on March 15, 2012 in Pocheon, South Korea. (Photo by Chung Sung-Jun/Getty Images)

Members of Germany's elite police unit, the Spezialeinsatzkommando, or SEK, demonstrate an abseil deployment from a helicopter during a media event on March 20, 2012 in Minden, Germany. The SEK is the special response team of Germany's state police force and typically deploys in high-risk situations, such as bank robberies, hostage takings and the arrest of armed and dangerous fugitives. (Photo by Thomas Starke/Getty Images)

Residents of the Santa Marta favela, Botafogo, south zone in Rio de Janeiro, Brazil unite to sanitize the community and fight the advance of the new coronavirus this Saturday, November 28, 2020. (Photo by Ellan Lustosa/ZUMA Wire/Rex Features/Shutterstock)

(L–R) Unknown, Alan Jones, Chrissie Hynde, Vivienne Westwood and punk fashion icon Jordan at Kings Road fashion shop «Sеx» run by Westwood and Malcolm McLaren in London, United Kingdom, 1976. (Photo by David Dagley/Rex Features/Shutterstock)

Seth Moniz and Kelly Slater, of the United States, embrace after Slater won the Billabong Pro Pipeline contest just short of his 50th birthday in Haleiwa, Hawaii, US on February 5, 2022. (Photo by Brent Bielmann/World Surf League via AP Photo)