Tanks in the Israeli Army one another in the 1967 and 1973 Arab-Israeli wars. Some feel the reason that Israeli Centurions defeated the Arab T-55's and even T-62's is because the Centurion has good sights and the Arab tanks were downgrades of the original design, as the T-55 used by the Soviet and Warsaw pact Armies had 200mm armor thickness while T-55's sold to the Arabs had only 120mm frontal armor and mediocre side and rear armor. M22 Locust – An American-designed airmobile light tank M4 Sherman – (Medium Tank, M4) Centurion tank (A41) –British main battle tank of the post-World War II period. Israel
Opposition to the war in Afghanistan (2001–2014) entering an eleventh year on October 7, 2011 and marking for the U.S. the longest period of sustained warfare in its history – greater than the time the United States was involved in World War I, World War II and the Korean War combined.<ref name="War and Sacrifice in the Post-9/11 Era"></ref> The war in Afghanistan surpassed the length of official U.S. participation in the Vietnam War, 8 years and 5 months, in the spring of 2010 to become the longest-running U.S. war ever. According to a study by the RAND Corporation, an American think tank working for the U.S. military,