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On a spring afternoon nearly a decade ago, Joseph "Dusty" Ridlon was walking a friend's dog along a street in Nyack, N.Y. – a suburb of New York City – when he picked up a shiny item on the ground covered in sand.

What happened next stunned him. There, in his hand, was a Purple Heart medal – one of the highest military honors awarded to those wounded or killed in action.

Now, some 10 years later, a nationwide search is underway to identify the rightful owner of the prestigious medal, which bears a single clue: an inscription on its back reading, "For Military Merit," and "B.J. McNamara Dec. 9, 1943."

"There's no doubt it’s a real Purple Heart," said Anthony DelRegno, a former Navy corpsman and post commander of the C.R. and R.O. Blauvelt American Legion Post 310 in Nyack.

"This is definitely someone who served in World War II," DelRegno told Fox News Tuesday. "This represents the highest honor a human being could get when it comes to serving one's country… This person is a hero who sacrificed his life."

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Ten years after it was found, there is a nationwide search underway to identify the rightful owner of the prestigious medal, which bears a single clue: an inscription on its back reading, "For Military Merit," and "B.J. McNamara Dec. 9, 1943." (Courtesy of Anthony DelRegno)

DelRegno first saw the medal in early July when a friend of Ridlon's brought it to post headquarters. Ridlon had tried to locate the owner himself before tucking the medal into a box for years and forgetting about it.

"It wasn't until I was cleaning out my house and throwing out stuff that I remembered I had it," said Ridlon, who noted that the medal is engraved with a likeness of George Washington on its front and missing its purple ribbon.

The Purple Heart is the oldest award still given to combat-wounded veterans of the U.S. military. The award – established by George Washington and originally called the Merit Badge – has been awarded nearly two million times to recognize the sacrifice of combat-wounded veterans.

There is no national database for all Purple Heart recipients, though various military organizations have been instrumental over the years in helping to reunite lost or stolen Purple Hearts with their owners or families. In 1973, a disastrous fire at the National Personnel Records Center destroyed approximately 16 to 18 million military personnel files – some of them Purple Heart recipients – DelRegno said.

DelRegno has summoned the help of war historian James Leiner, who DelRegno said has so far identified 12 or 13 McNamaras in the U.S. with the first name initials, "B.J."

"But none of these names may be the one he’s looking for," said DelRegno. "It’s a challenge – figuring of what these initials stand for."

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The award – established by George Washington and originally called the Merit Badge – has been awarded nearly two million times to recognize the sacrifice of combat-wounded veterans. (REUTERS/Adrees Latif)

The office of Sen. Charles Schumer, D-N.Y., is also assisting in the quest to find B.J. McNamara or his family.

DelRegno, meanwhile, said he's confident the medal will be returned to its rightful owner.

"I'm truly optimistic that that’s going to happen," DelRegno said. 

"The true measure of a man’s worth is the memories people have of him," he said, "And I’m hoping the medal can be returned to his family or to the veteran if he’s still alive."