You can read about it in the Seattle Post without any registration or at the NY Times, which does include an awfully cute photo of a worker rat.
Those of you with good rat-in-the-news memories might recall that Gambian rats were a suspected vector of monkeypox about a year ago. It is still, AFAIK, illegal to import them into this country.
So, this time, the rats are paying us back by risking their tails to help us find unexploded landmines. Now if only we can train humans not to bury landmines, we'll really be making some progress!