"What Trump appeared to be suggesting by floating retrieving the equipment would require a re-invasion of Afghanistan, a country that has resisted invasion and occupation by the world’s two nuclear superpowers — the Soviet Union in the late 1970s and early 1980s, and the United States during a 20-year war that began shortly after the September 11, 2001 terror attacks on New York and Washington and ended when the U.S. pulled out two decades later."