Since then, Agent Orange has been linked to a horrifying array of cancers, diabetes, respiratory diseases and blindness among U.S. veterans -- not to mention two generations of sick Vietnamese -- and even birth defects in children of vets.

But for decades, the Canadian military has refused to acknowledge the Gagetown horror ever happened, much less any connection between Agent Orange and sick vets.

Sun Media has now learned that 10 months ago, for the first time in four decades, the government quietly accepted a medical compensation claim from a retired Canadian brigadier-general stricken with leukemia.

A decorated officer of foreign wars with the Calgary Highlanders, Gordon Sellar rose to the very top of Canada's military, retiring as head of Canada's land forces.

But, during this storied career, he also commanded the Black Watch regiment at Gagetown -- sadly, at the precise time the U.S. was poisoning the place with Agent Orange.

In a landmark decision, the Department of Veterans Affairs has ruled Sellar's cancer was caused by his exposure to Agent Orange. "The department is aware that Agent Orange was used as a herbicide for defoliation on the training grounds of CFB Gagetown," the confidential memorandum states.

"The department accepts the medical opinion (of Sellar's doctors) and the results of published U.S. medical research that establishes a causitive relationship between Agent Orange exposure and the development of chronic lymphocytic leukemia."

The decision was so strong and unequivocal that it provided the maximum possible pension compensation.

More significantly, it should open the door to similar claims from potentially thousands of other sick and dying Canadian vets exposed to Agent Orange at Gagetown.

An official at Veterans Affairs admits the department has done nothing to publicize the Sellar decision, nor otherwise reach out to help victims of Agent Orange.

"Perhaps when your article appears, more will come forward," the official said.

If so, the Sellar decision will stand as a fitting final salute to a revered general who cared deeply about the men in his command, a soldier who would have done anything to spare others the medical misery wrought upon their ranks.

A decorated war hero who survived the bloody battlefields of Europe and Korea, it is surely beyond cruel that Gordon Sellar would be felled on a chemical killing field at his own army base.

On Oct. 1, 2004, two weeks after the first compensation payment appeared in his pension cheque, the brigadier-general lost his final battle, a 15-year fight with the cancer he inherited from Agent Orange.

At his side as she had been throughout his long illness was the love of his life, Gloria, his wife and soulmate of 60 years. At 77, for all the hard years of caring for her ailing husband, she remains a remarkable woman of quiet grace, intelligence and wit.

If the Agent Orange victory belongs to anyone in this country, it is to this elegant lady of steely tenacity for whom even the indomitable defence bureaucracy was clearly no match.

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The first time Gloria saw the chemical drums with their telltale orange stripes was in U.S. army trucks parked at the Oromocto Hotel next to the Gagetown base.

"We were between houses and staying at the hotel," she recalled during an interview last week. "The American soldiers were staying there, too, and would come in every evening filthy dirty. It was no secret what they were doing. Of course, no one realized the potential of what was happening at the time. I hate to think what happened to those poor men."

Gordon Sellar began his career fighting overseas in the Second World War with the Calgary Highlanders. By the time he reached Gagetown in 1963, he was a colonel and commanding officer of the 1st Battalion, Black Watch, with more than 1,000 men under him.

Like all infantry in training, they probably spent more time on their bellies than on their feet. Little did they know they were crawling through an invisible swamp of deadly poison.

"We exercised for lengthy concentrated periods in the contaminated areas," he would later write in one official memo. "We lived on the ground in camp and trained both day and night. Our food was prepared there ... in areas that had been defoliated.

"We didn't know it was Agent Orange."

Gloria has trouble looking at photographs from those days; the one of Gordon in his full field gear, another of the two of them when they were leaving Gagetown in 1967.

"I look at the two of us in that picture, and think, gosh, we just didn't have a clue what had happened... By then, it (Agent Orange) was already there; it had started."

Over the next decade, Sellar continued marching to the top of the military, retiring in 1977 as the director-general of Canadian land forces in Ottawa.

Gloria says the ensuing 15 years were a dream fulfilled, living on a 58-acre country estate north of Kingston, close to their three grown children, free to pursue a lifelong passion for horses that first brought the couple together as kids growing up in Calgary.

As always, Gordon kept in top physical condition. Until one day in 1994 when the dizzy spells started.

A simple blood test revealed the horrible truth: He had a form of leukemia that could spread cancer anywhere in his body at any time -- one of the diseases being associated with Agent Orange.

By then, the effects of the odious Vietnam herbicide were being loudly debated in the U.S., with hundreds of thousands of vets on a special government health watch.

Before long, Gloria put it all together with the orange barrels and the American soldiers at the Oromocto Hotel.

"We were obviously shattered by all this, and I said to the doctor at the time that this man was exposed to Agent Orange.

"And he just said, 'Oh?' He didn't know anything about it."

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The Kingston condominium is dominated by two large oil paintings on opposite walls, portraits of Gordon and Gloria Sellar staring out at the one thing that mattered most in their six decades together -- each other. The two faces painted in happier times are looking across a huge dining table covered in stacks of books, research papers and correspondence.

It is all the ammunition in Gloria's arsenal, a 15-year campaign to bring sense to the unthinkable -- her husband's slow decline into a medical hell, not of his own making.

It started with debilitating bouts of pneumonia that put him into hospital, his immune system all but wiped out by the leukemia. Then came the tumours -- first one under his eye, then on the side of his head, then one in his ear, which took so much chemotherapy his trips to the clinic became daily.

Every time her husband was examined by doctors from Veterans Affairs, Gloria was on their case about Agent Orange.

Why was it not being recognized by the Canadian government, the same government that let the Americans spray it all over Gagetown? And, what about thousands of other men exposed?

She started burying Veterans Affairs in letters and thick files of information she had gathered on Agent Orange.

"They were actually very good with me. They seemed quite surprised by some of the information I was giving them. It's just that everything moves so very slowly."

Everything except her husband's cancer. By 2000, he was in a wheelchair, and their beloved country estate, horses and their teams of prize hunting dogs were all gone.

In May 2003, he entered a chronic care hospital to recover from an emergency hernia operation. He would never go home.

Despite virtually moving into the hospital, Gloria kept up her crusade for justice. All she wanted was a simple recognition that Agent Orange was killing her husband, and possibly legions of others like him.

She tried to track down members of the Black Watch who had served under him. Many were sick. Many more had already died. All were afraid to talk about the dirty secret of Gagetown.

The Canadian defence department wasn't helping. As late as February 2004, the Canadian military posted a stunning "health bulletin" on its government website. By then, more than 10,000 American veterans of the Vietnam War were in active treatment for cancers and other diseases related to Agent Orange. Another 312,000 were under medical surveillance.

Yet the Canadian bulletin stated "extensive research" had concluded that "Agent Orange was unlikely to be the cause of the (Vietnam) veterans' symptoms or illnesses."

Only months after the bulletin was issued, Gloria won her case with Veterans' Affairs, the government having finally acknowledged Agent Orange had given her husband terminal cancer.

He died a few weeks later.

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Gordon Sellar's funeral attracted some of Canada's finest soldiers still alive. One of them, a young lieutenant in the Black Watch at Gagetown during the tests was asked how he was doing.

"Not too well," he replied. "No one seems to know why, but I have throat cancer, and I have never smoked."