The M9 Half-track was a half-track produced by International Harvester in the United States in World War II for Lend-lease supply to Allies. It was designed to supersede the M2 Half Track Car which was mostly outclassed by 1942. 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 long time, and is still in service with Paraguay today. 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.