Robert H. York was a career officer in the United States Army. A 1938 graduate of the United States Military Academy, he attained the rank of lieutenant general, and was a veteran of World War II, Allied-occupied Germany, the Malayan Emergency, the Vietnam War, and Operation Power Pack, the 1965 U.S. intervention in the Dominican Republic during its civil war. His command assignments included the 331st Infantry Regiment, director of the Tactical Department and director of instruction at the United States Army Infantry School, director of the International Division in the army's Office of the Chief of Research and Development, director of Defense Research and Engineering for the United States Department of Defense, director of the Defense Advanced Research Projects Agency's Research and Development Field Unit and Joint Operations Evaluation Group in South Vietnam, the 82nd Airborne Division, the Infantry School, and XVIII Airborne Corps.