A brigade of beagles helps the US save billions at America's busiest airports

Chaze, Cardie, Marlee and Chipper, as seen from left to right, graduate into the "Beagle Brigade" and wear their uniforms for the first time.

(CNN)Meet America's newest, and cutest, federal officers: a band of rescued beagles known as Chipper, Marlee, Chaze and Cardie.

Starting next week, these four will begin their careers at two of America's busiest airports, Atlanta's Hartsfield-Jackson and Chicago's O'Hare. They will join the hundreds of beagles already at work at ports of entry in the US and abroad.
Their mission: to sniff out bags carrying meat and plant products. Why? Because meats and plants can carry pests that could seriously hurt the economy.
    Chipper gives his trainer a celebratory kiss at the graduation ceremony.
    Joseph Chopko, who helped train these dogs, explains it this way:
    You can't bring in fruits, such as apples or oranges, because they can carry fruit flies. And Mediterranean fruit flies, an invasive pest, can devastate the citrus industry.
    Chipper wears his uniform for the first time.
    "There wouldn't be enough natural predators to keep them in check," said Chopko, a training specialist with the US Agriculture Department. "And the way they multiply, the devastation that happens on the fruit is dangerous."
    Chipper sniffs for fruits, plants, and meat products in an airport simulation activity.
    Another example is pork, which can carry African swine fever, Chopko said.
    "If that meat gets into the United States, that could devastate the whole pork industry. We're talking billions of dollars, not just in lost revenue, but also in lost jobs and eradication efforts."
    Cardie (middle) hugs her handler's leg just before graduation.
    Enter the beagle brigade.
    This breed of dogs is picked for the task because their sense of smell is incredible. They also have a natural charisma.