2003年3月20日,美军空袭巴格达,完成从伊拉克危机到伊拉克战争的转变。这次危机的重要起因之一就是美国认定伊拉克目前还拥有大规模杀伤性武器,主要是生物和化学武器,因此,作为最基本的应对生化武器攻击的装备,所有参加伊拉克战争的美军士兵都装备了防化服。那么,美军士兵穿的是何种型号的防化服,目前美国在这方面的进展又如何呢? On March 20, 2003, U.S. troops carried out air strikes on Baghdad to complete the transition from the Iraqi crisis to the Iraq war. One of the important causes of this crisis is that the United States finds that Iraq currently possesses also weapons of mass destruction, mainly biological and chemical weapons. Therefore, as the most basic equipment to deal with the chemical and biological weapons attack, all the U.S. soldiers participating in the Iraq war are equipped Protective clothing. So, what type of anti-chemical war suits are worn by U.S. soldiers? At present, what is the progress made by the United States in this regard?