 The M9 served for a significant amount of time . 3 @,@ 500 were produced by the end of World War II . It was used during World War II , the Arab @-@ Israeli War of 1948 , the Korean War , the Suez Crisis , the Vietnam War , the Six @-@ Day War , and the Yom Kippur War . It was used by eleven different countries by the end of its service . 
