US uses white phosphporous weapons in Iraq

Breathing white phosphorus for short periods may cause coughing and irritation of the throat and lungs. Breathing white phosphorus for long periods may cause a condition known as "phossy jaw" which involves poor wound healing of the mouth and breakdown of the jaw bone.

Eating or drinking small amounts of white phosphorus may cause liver, heart, or kidney damage, vomiting, stomach cramps, drowsiness, or death. We do not know what the effects are from eating or drinking very small amounts of white phosphorus-containing substances over long periods of time. Skin contact with burning white phosphorus may burn skin or cause liver, heart, and kidney damage.

White Phosphorus (WP), known as Willy Pete, is used for signaling, screening, and incendiary purposes. White Phosphorus can be used to destroy the enemy's equipment or to limit his vision. It is used against vehicles, petroleum, oils and lubricants (POL) and ammunition storage areas, and enemy observers. WP can be used as an aid in target location and navigation. It is usually dispersed by explosive munitions. It can be fired with fuze time to obtain an airburst. White phosphorus was used most often during World War II in military formulations for smoke screens, marker shells, incendiaries, hand grenades, smoke markers, colored flares, and tracer bullets.

The Battle of Fallujah was conducted from 8 to 20 November 2004 with the last fire mission on 17 November. The battle was fought by an Army, Marine and Iraqi force of about 15,000 under the I Marine Expeditionary Force (IMEF). US forces found WP to be useful in the Battle of Fallujah. "WP proved to be an effective and versatile munition. We used it for screening missions at two breeches and, later in the fight, as a potent psychological weapon against the insurgents in trench lines and spider holes when we could not get effects on them with HE. We fired “shake and bake” missions at the insurgents, using WP to flush them out and HE to take them out. ... We used improved WP for screening missions when HC smoke would have been more effective and saved our WP for lethal missions."

White phosphorus is not banned by any treaty to which the United States is a signatory. Smokes and obscurants comprise a category of materials that are not used militarily as direct chemical agents. The United States retains its ability to employ incendiaries to hold high-priority military targets at risk in a manner consistent with the principle of proportionality that governs the use of all weapons under existing law. The use of white phosphorus or fuel air explosives are not prohibited or restricted by Protocol II of the Certain Conventional Weapons Convention (CCWC), the Convention on Prohibitions or Restrictions on the Use of Certain Conventional Weapons which may be Deemed to be Excessively Injurious or to have Indiscriminate Effects.