Jack Edward Dunlap (November 14, 1927 – July 23, 1963) was a United States Army sergeant stationed at the National Security Agency who became a spy for the Soviet Union in the early 1960s.

[1] Learning of Dunlap's sensitive position, a KGB agent approached him in 1958, bluntly offering him to be "paid handsomely" for the contents of the pouches he was carrying.

Before delivering the documents, Dunlap slipped them under his shirt, drove to a meeting point in Washington, D.C., had his contact make copies or photograph them, then returned them to the pouch and made his delivery.

To continue making money from the Soviets, Dunlap believed that he could stay on at NSA by simply not re-enlisting when his tour of duty expired.

The Director of Security for NSA told FBI agents that he and his assistant paid a visit to Dunlap's widow to offer their condolences, and she said, "You probably want his papers", showing them classified material.