1989年,美国战略导弹试验屡遭失败。3月14日,美国海军的三叉戟ⅡD5导弹的首次潜艇试射失控,导致导弹自毁;8月15日,三又戟ⅡD5导弹在进行第三次潜艇试射时,飞行了4秒钟就出了故障;5月11日,美国空军的侏儒导弹首次试射在飞行70秒时发生翻滚,致使飞行终止;9月14日,美国空军的MX导弹在首次作战试射时也失败了。 In 1989, the U.S. strategic missile test repeatedly failed. On March 14, the first submarine test of the U.S. Navy’s Trident II-D5 missile went out of control and led to the self-destruction of the missile. On August 15, three and halberd IID5 missiles were flying for 4 seconds while conducting the third submarine test. On May 11, the first test flight of the U.S. Air Force dwarf missile lashed out at 70 seconds of flight, causing the flight to end. On September 14, the U.S. Air Force’s MX missiles failed during the first combat test.