Why Is the USDA Buying Submachine Guns With 30 Round Clips, Night Vision And Thermal Scopes?

A May 7th solicitation by the U.S. Department of Agriculture seeks “the commercial acquisition of submachine guns [in] .40 Cal. S&W.”
According to the solicitation, the Dept. of Agriculture wants the guns to have an “ambidextrous safety, semiautomatic or 2 round [bursts] trigger group, Tritium night sights front and rear, rails for attachment of flashlight (front under fore group) and scope (top rear), stock collapsible or folding,” and a “30 rd. capacity” magazine.
They also want the submachine guns to have a “sling,” be “lightweight,” and have an “oversized trigger guard for gloved operation.”  (source)
This whole thing gets more disturbing by the day. The U.S. Department of Agriculture has no police powers nor should it be necessary for that department to need these kinds of military weapons with heat scopes for night or smoke visibility.
The question that needs to be asked is: why does the USDA need semi-automatic weapons?
According to gunssaveslives.net it could be the US Forest Service, which does fall under the USDA and has a law enforcement division, but the request does not mention the USFS, so can they be ruled out?
So again, whom are they planning to go to war with?