Sentence:  It seems reasonable that if general nuclear war is not to be one cataclysmic act of burning each other 's citizens to cinders , we must have a manned strategic force of long-endurance aircraft capable of going into China or Russia to <WSD>find</WSD> and destroy their strategic forces which continued to threaten us . 
Meaning of the word marked with <WSD> tags:  come upon after searching; find the location of something that was missed or lost