Dugald Leslie Pinyan is an United States Army soldier who went missing in action on October 15, 1918. He enlisted from Arizona and was assigned as a Private to the 32nd Division, 128th Infantry Regiment. He was reportedly killed in action in France, but few details are available in his case and no images of him are available.
After his disappearance, he was awarded the Purple Heart and presumably the World War I Victory Medal. His name is also memorialized at the Meuse-Argonne American Cemetery and Memorial in Romagne-sous-Montfaucon, France and he has a grave at Block 17, Lot 20, Space 2 in Cedar Grove Cemetery in Mancos, Colorado.
Pinyan remains part of the 4,223 Americans who remain unaccounted for during World War I. Additionally, he is one of eight Arizonans who are unaccounted for during World War I. Their cases are not under investigation by the Defense POW/MIA Accounting Agency.