In 1991, new weapons were used for the first time by the American and British troops in Iraq. These weapons proved to have high destructive capability against armored machinery and tanks. Later, there were many signs of being a weapon to destroy the human beings, animals and plants, which raised huge controversy and sharp criticism among scientists, doctors and environmentalists. Despite the opacity and deception, many of the secrets of depleted uranium ammunition were exposed, and confirmed the seriousness of use and serious repercussions on the environment and public health, which stepped up the international campaign against its manufacturing and use. However, the brilliant military success and profits of the military industry tempted the Pentagon and NATO to continue production and use of these weapons. Despite the high human and environment risks DU was used in various conflicts like Iraq, Bosnia, Kosovo and Serbia, Afghanistan, Gaza, Lebanon and recently in Libya. It is noteworthy to mention that the public and even some scientists, researchers and news media are ignorant of the effects and risks of the use of DU in military operations. This raises the point that there should be a large campaign to raise public awareness to prevent the risk of DU weapons. Based on scientific research and updates, we would like to high light the waste of wars in Iraq: Our paper shed the light on the size of depleted uranium(DU) weapons used in the wars on Iraq and the legacy of waste (their nature, size, and the contaminated regions), as high risks on humans and the environment. This is one of the leading environmental, health and social tragic problems in Iraq. This problem should be addressed immediately, seriously and effectively.