Well, better go ahead and move this to the Politics forum before it gets nasty. There seems to be one fact:
Both the EPA and IRS currently have armed federal agents, and recent events involving the BLM in Nevada showed that even the Bureau of Land Management possesses a small army of long-range snipers and heavily armed paramilitary operators.
Now the U.S. Department of Agriculture is joining the militarization bandwagon, publishing a solicitation (# USDAOIGWEA-5-7-14) requesting "submachine guns, .40 Cal. S&W" with "Tritium night sights for front and rear, rails for attachment of flashlight (front under fore grip) and scope (top rear), stock-collapsible or folding, magazine - 30 rd."
Beyond the above, all there is are biased, opinionated and politicized commentary.
Me, I can easily postulate the need...we see an explosion of wild hogs and coyotes here in Texas, elsewhere, too. A coyote killed a baby calf of mine just a week ago. It would seem reasonable to me to provide arms to USDA workers who are very likely to run across these in the field. All farmers and ranchers I know of consider these vermin needing massive population reduction. Clearly, they cause huge economic loss annually. The caliber is good for dropping tough animals such a 400 lb hog and tritium sights are excellent for low light/night conditions. You gotta take out these critters when you see them, and, in Texas anyway, there are no restrictions regarding time of day, week, month or method for taking them. Often hogs and coyotes run in bunches and high rate of fire is needed to drop several before they disappear. This is my postulation (conspiracy theory), and I'm sticking to it because it provides a legitimate ag based reason for the fire arms.