Sentence:  Or put another way , the hardest missile site planned today could be destroyed by placing a one-kiloton warhead ( 1 20 th the size of those <WSD>used</WSD> in Hiroshima and Nagasaki ) within 100 to 200 feet of the target ! 
Meaning of the word marked with <WSD> tags:  put into service; make work or employ for a particular purpose or for its inherent or natural purpose