一、迫切需要性能好的烟幕美军现装备的烟幕弹药和烟幕器材产生的烟幕通常只能用于遮蔽在可见光范围内工作的光学观瞄系统。为对付这类光学系统,现代战场上仍然需要制式烟幕武器。美军从现代战场上出现的大量的雷达、红外、激光武器系统对自己可能构成的威胁出发,七十年代中期以后提出需要能够对抗这些在中、远红外(3～5微 First, there is an urgent need for a good performance smokes The smokescreens produced by smuggled ordnance and smokescreen equipment currently provided by the U.S. military are usually only used to shield optical sighting systems that operate in the visible range. To cope with this type of optical system, the modern battlefield still needs standard smoke weapons. Starting from the threat posed by the large number of radar, infrared and laser weapon systems that emerged from modern battlefields, the U.S. military proposed in the mid-1970s that it needs to be able to confront these intermediate and far-infrared (3 to 5 micro