Part One: Devices and Deliverable Warheads Editor’s Note: This is the second in a series of analyses on the feasibility and relevance of nuclear weapons in the 21st century. About 110 U.S. B61 tactical nuclear weapons were removed from the Royal Air Force base at Lakenheath in Suffolk, England, the Federation of American Scientists said June 26. This removal of the last U.S. nuclear weapons maintained in the United Kingdom follows similar reductions at Ramstein Air Base in Germany in 2005 and in Greece in 2001. The reductions are emblematic of a continued — if slow — move away from the nuclear posture of the 20th century. For the better part of that century, the existence of nuclear weapons was defined by the Cold War. That legacy still largely informs global nuclear dynamics to this day.