Brainerd-based Mills Fleet Farm has been sold to New York-based KKR one of the country’s largest investment firms. Mills Fleet Farm has 35 retail stores throughout Minnesota, Wisconsin, Iowa and North Dakota and employs around six-thousand people. In October Fleet Farm officials announced the company was for sale, saying they’ve reached a point where, in order to grow at a speed to be competitive, it needed to look for outside sources for capital. Terms of the deal, are expected to be announced later today.