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UNION, Mo. (KSDK) – It's a rolling tribute to three local children battling cancer.

Zac Gossage, Harmony Quade and Julie Stone's pictures are now on the side of a semi-truck, which rolled into the Union Wal-Mart this morning.

Wal-Mart truck drivers started the project 17 years ago to raise awareness for childhood cancers.

Zac – who is in remission – was an honorary driver.

We first introduced you to Zac in one of our Making a Difference reports. His best friend, Vincent Butterfield, shaved his head in his honor.

You can read that story here: http://on.ksdk.com/1eYGnA0.

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