But a little-known 1993 Defense Department document written by then-Brigadier Gen. Eric Shinseki, now the secretary for the Department of Veterans Affairs (VA), shows that the Pentagon was concerned about DU contamination and the agency had ordered medical testing on all personnel that were exposed to the toxic substance.

Shinseki's memo, under the subject line, "Review of Draft to Congress - Health and Environmental Consequences of Depleted Uranium in the U.S. Army -- Action Memorandum," makes some small revisions to the details of these three orders from the DoD:

1. Provide adequate training for personnel who may come in contact with DU contaminated equipment.

2. Complete medical testing of all personnel exposed to DU in the Persian Gulf War.

3. Develop a plan for DU contaminated equipment recovery during future operations.

The VA, however, never conducted the medical tests, which may have deprived hundreds of thousands of veterans from receiving medical care to treat cancer and other diseases that result from exposure to DU.

The Armed Forces Health Surveillance Center recently reported that ten years of data confirm that service members tend to have higher rates of certain cancers compared to civilians, according to the Army Times. While researchers suspected that service members are diagnosed with cancer more often and at a younger age because they have guaranteed access to health care and mandatory exams, the data does not explain the disparities in diagnosis among branches of the military. For example, the rate of lung cancer among sailors is twice that of other branches, while Marines have much lower cancer rates across the board.

On Tuesday, the VA's ongoing failure to treat and diagnose Gulf War related illnesses came up during a House Veterans Affairs subcommittee hearing where a veterans advocacy group urged Shinseki to undertake comprehensive research on the correlation between chronic illness and exposure to DU in munitions during the Gulf War.

Armed with Shinseki's August 19, 1993 memo, Veterans for Common Sense (VCS), said the VA, and Shinseki in particular, have "a rare opportunity for a second chance."

"In military terms, VCS asks VA for a ceasefire," said Paul Sullivan, the executive director for VCS. "VCS urges VA leadership to stop and listen to our veterans before time runs out, as VA is killing veterans slowly with bureaucratic delays and mismanaged research that prevent us from receiving treatments or benefits in a timely manner."

Sullivan, himself a Gulf War veteran, told the subcommittee that the VA has refused to listen to scientists and veterans who are concerned about DU, leaving thousands of veterans suffering from chronic illnesses related to the conflict unsure if they will ever receive a solid diagnosis to justify the benefits and treatment they need.

Of the 697,000 men and woman who served in Gulf War operations Desert Storm and Desert Shield between 1990 and 1991, about 250,000 suffer from symptoms collectively known as "Gulf War Veterans' Illnesses." The symptoms include fatigue, weakness, gastrointestinal problems, cognitive dysfunction, sleep disturbances, persistent headaches, skin rashes, respiratory conditions and mood changes, according to the VA.

The VCS also petitioned Shinseki to investigate the 2009 termination of a $75 million research project on Gulf War illnesses at the University of Texas medical center. Last year the VCS filed a Freedom of Information Act (FOIA) request for records of the "internal sabotage" of Gulf War Veterans Illnesses research and the intentional delaying of research and treatment, according to Sullivan. The VA has yet to release any documents about the impeded research, and VCS filed a FOIA appeal on June 29.

Sullivan said the VCS simply wants the government to support independent testing on veterans exposed to DU, but the Department of Defense prefers a "don't look, don't find policy."

"As a Gulf War veteran, I have watched too many of my friends die without answers, without treatment, and without benefits," Sullivan said. "In a few cases, veterans completed suicide due to Gulf War illness and the frustration of dealing with VA."

Sullivan testified as disturbing reports have emerged in recent months from Fallujah, Iraq, about the skyrocketing rates of birth defects and cancer,  which are being blamed on DU-laced bombs and munitions used by US and British forces during a brutal coalition assault on the city in 2004. Iraqi human rights officials are reportedly planning to file a lawsuit.

DU is a dense metal added to munitions and bombs to pierce tanks and armor, and the military seems to chose unrestricted use of the radioactive substance over its soldiers' safety. Sullivan told Truthout that original medical tests ordered in a 1993 memo, which also called for personnel to be trained in dealing with contaminated equipment, were canceled after a training video scared soldiers.

"It was pulled after [the training video] was seen by some soldiers who became upset when they saw soldiers in moon suits holding Geiger counters, and the military realized that the training could present a problem in the battlefield where soldiers need to disregard exposure issues while trying to kill the enemy," Sullivan said.

Sullivan said that the DU "follow-up" program the VA consistently references was inadequate as it consisted of sporadic studies on only a small fraction of estimated 400,000 veterans exposed to the radioactive heavy metal.

"The VA does not listen to expert scientists. The VA does not even listen to Congress," Sullivan said in his testimony. "Two decades of inaction have already passed. Gulf War veterans urgently want to avoid the four decades of endless suffering endured by our Vietnam War veterans exposed to Agent Orange."

Sullivan said it took 40 years and an act of Congress to fund and sanction independent studies that proved the VA was responsible for providing benefits to soldier suffering from Agent Orange-related diseases.

The VA now recognizes that exposure to Agent Orange, an herbicide sprayed across Vietnam to kill foliage and expose guerrilla fighters, has plagued veterans with several deadly diseases and disorders.

VCS also advocated for the research on post-traumatic stress disorder (PTSD) that became the foundation of new PTSD rules, making it easier for veterans to receive benefits.

Last week, the VA announced $2.8 million worth of research on Gulf War Veterans' Illnesses, a sum Sullivan called "paltry." A VA press release announcing the research does not mention DU. The release references a recent Institute of Medicine report that identified the quarter million veterans affected by various symptoms associated with Gulf War illness, which "cannot be ascribed to any psychiatric disorder and likely result from genetic and environmental factors, although the data are not strong enough to draw conclusions about specific causes."

Popular medical science holds that kidney damage is the primary health problem associated with exposure to high amounts of DU. The heavy metal is 60 percent as radioactive as natural uranium, and is also linked to lung cancer in some cases and leukemia in even fewer cases, according to the World Health Organization (WHO).

Some critics have claimed that the WHO and governments have suppressed links between DU and cancer.

The debate over the use of DU in conventional warfare will rage on as the Fallujah fallout continues, but according to Sullivan, there is only one way for thousands of Gulf War veterans at home to know the truth and receive the relief they deserve.

"After 20 years of waiting, we refuse to wait on more empty promises from VA. The first step is for Secretary Shinseki and Chief of Staff Gingrich to immediately clean house of VA bureaucrats who have so utterly and miserably failed our veterans for too long," said Sullivan, vowing to petition Congress if the VA refuses to respond. "Our waiting must end now."