M69 incendiary M69 incendiary The M69 incendiary bomblet was used in air raids on Japan and China during World War II. They were nicknamed "Tokyo calling cards". The M69 was a plain steel pipe with a hexagonal cross section in diameter and long. It weighed about . The bomblet used napalm (jelled gasoline) as an incendiary filler, improving on earlier designs which used thermite or magnesium fillers that burned more intensely, but were less energy- and weight-efficient, and were easier to extinguish. In Germany they were filled with jellied oil and dropped in clusters of 36 in the non-aerodynamic M19 bomb. Over
Incendiary ammunition VI incendiary were used until production increased to sufficient levels. By 1942 the standard loading for fixed .303s was half loaded with AP and half with incendiary bullets. One fighter pilot who was shot down by incendiary ammunition while flying in the Battle of Britain describes his experience: The British Mk VI bullet was copied by the United States in simplified form, for both their .30 and .50 aircraft bullets. The British then adopted the simplified design as the Mk VII bullet. Incendiary projectiles, in particular those intended for armor penetration, are more effective if they explode after penetrating a