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The M9 half-track was a half-track produced by International Harvester in the United States during World War II for lend-lease supply to the Allies. It was designed to provide a similar vehicle to the M2 half-track car. It had the same body and chassis as the M5 half-track (also built by International Harvester for lend-lease) but had the same stowage and radio fit as the M2 half-track.
The M9 served for a significant amount of time. Three thousand five-hundred 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 had been used by eleven different countries by the end of its service.