Karen Lee Valdez was 26 and stationed at F.E. Warren Air Force Base in Cheyenne, Wyoming, when she was last seen on November 21, 1983. Witnesses saw her that day loading her yellow Dodge Ram, possibly preparing to visit a friend in Denver, but she never arrived and the truck was never recovered. A month after she vanished she was briefly classified as a deserter, a designation later changed to missing after the Air Force could not confirm whether her departure was voluntary.

Valdez is described as a white female with brown hair and blue eyes, about 5 feet 2 inches and 118 pounds. She had family in Florida. The Air Force Office of Special Investigations has periodically reinvestigated the case and continues to seek new leads in hopes technology or public information will help resolve what happened.

If anyone knew Karen, saw a yellow Dodge Ram in late November 1983, or has information that could help, please come forward.