John Kinsel Sr., a World War II veteran who was one of the last surviving Navajo Code Talkers, a group of Marines whose encrypted wartime messages based on the Navajo language helped secure an Allied victory in the Pacific, died on Saturday. He was 107.

Buu Nygren, president of the Navajo Nation, announced Mr. Kinsel’s death in a post on social media. No cause was given.

An estimated 400 Navajo Code Talkers served during World War II, transmitting a code crafted from the Navajo language that U.S. forces used to confuse the Japanese and communicate troop movements, enemy positions and other critical battlefield information. Mr. Kinsel, who served from October 1942 to January 1946, was part of the second group of Marines trained as code talkers at Camp Elliott in California, after the original 29 who developed the code for wartime use.

The code was never broken. A fictionalized version of the codetalkers’ story was depicted in the film “Windtalkers,” directed by John Woo.

In an interview in 2019 with The Arizona Republic, Mr. Kinsel remembered training alongside 25 other marines at Camp Elliott, and he recalled working with some of the original 29 to develop additional code, including by working on code words for military words like “tank” and “aircraft.”

Mr. Kinsel was assigned to the Ninth Marine Regiment, Third Marine Division, and took part in the battles of Bougainville (in Papau New Guinea), Guam and Iwo Jima. He was never deployed to the front lines, according to the U.S. Department of Veterans Affairs, but he worked with his division headquarters while on Bougainville Island to develop code and transcribe messages.

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