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 device dubbed the new incendiary bomb the Superflamer. Around fifty-five million incendiary bombs were dropped on Germany by Avro Lancasters alone. Many incendiary weapons developed and deployed during World War II were in the form of bombs and shells whose main incendiary component is white phosphorus (WP), and can be used in an offensive anti-personnel role against enemy troop concentrations, but WP is also used for signalling, smoke screens, and target-marking purposes. The U.S. Army and Marines used WP extensively in World War II and Korea for all three purposes, frequently using WP shells in large 4.2-inch chemical mortars. WP was