The M3 half-track was an armoured vehicle used by the United States during World War II. Download high resolution version (1800x1200, 1578 KB) [1] File history Legend: (cur) = this is the current file, (del) = delete this old version, (rev) = revert to this old version. ... Download high resolution version (1800x1200, 1578 KB) [1] File history Legend: (cur) = this is the current file, (del) = delete this old version, (rev) = revert to this old version. ... M3 half-track A half-track is a civilian or military vehicle with regular wheels on the front for steering, and caterpillar tracks on the back to propel the vehicle and carry most of the load. ... Mushroom cloud from the nuclear explosion over Nagasaki rising 18 km into the air. ...