Tanks of the United States saw limited action in the battle for Normandy as armored recovery vehicles with dummy guns. The M4 was the best known and most used American tank of World War II. Christened "Sherman" by the British, it was named for the famous US Civil War General, William Tecumseh Sherman. The M4 Sherman was a medium tank that proved itself in the Allied operations in North Africa, Europe and the Pacific theaters of war in World War II. The Sherman was a relatively inexpensive, easy to maintain and produce combat system. Similar to production efforts on the part of the Soviet Union
US signals intelligence in the Cold War a decade of world change, with changes in Cold War alliances and emphasis, the first submarine attack since World War II in the context of a regional war involving extensive power projection, low- and medium-intensity operations, and continuing national policy development. Roughly from the late 1980s on, there was cooperation between the US and the PRC in collecting SIGINT of mutual interest, principally against Russia. It is believed that the Qitai and Korla sites, in Xinjiang (Sinkiang) are operated jointly by the Chinese and the US CIA Office of SIGINT Operations against Soviet missile tests and space launches, but their