Veteran-owned Gray Water Ops, LLC designs and manufactures custom challenge coins, including its patented NFC-enabled Smart Coin®, along with lapel pins and patches. Founded by artist Keith Hanshaw and William Zutell, the company draws on more than 30 years of challenge-coin design experience, with Hanshaw designing coins for military units, law-enforcement agencies, businesses and nonprofits since 1995. Its signature Smart Coin® combines a solid brass, high-relief commemorative coin with an embedded chip that opens a digital experience when tapped with a smartphone.