A shell coated with depleted uranium pierces a tank like a hot knife through butter. It also leaves behind a fine radioactive dust with a half-life of 4.5 billion years. Depleted uranium is the garbage left from producing enriched uranium for nuclear weapons and energy plants. At Walter Reed Army Medical Center in Washington, D.C., [Herbert Reed] ran into a buddy from his unit. And another, and another. They began to talk. [They] all have depleted uranium in their urine. The veterans, using their positive results as evidence, have sued the U.S. Army, claiming officials knew the hazards of depleted uranium, but concealed the risks. The Department of Defense says depleted uranium is powerful and safe. Military research on mice shows that depleted uranium can enter the bloodstream and come to rest in bones, the brain, kidneys and lymph nodes. Other research in rats shows that DU can result in cancerous tumors and genetic mutations. Fifteen years after it was first used in battle, there is only one U.S. government study monitoring veterans exposed to depleted uranium. Number of soldiers in the survey: 32. Depleted uranium falls into the quagmire of Gulf War Syndrome, from which no treatment has emerged. About 30 percent of the 700,000 men and women who served in the first Gulf War still suffer [this] baffling array of symptoms. Depleted uranium has long been suspected as a possible contributor. It took more than 25 years for the Pentagon to acknowledge that Agent Orange...was linked to [major disease and] sufferings. It took 40 years for the military to compensate sick World War II vets exposed to massive blasts of radiation during tests of the atomic bomb.