Ron Swanson tells Lauren "This is a Claymore land mine. Use that to protect your property". Later Lauren's mother gives it back to him and also calls it a landmine. The item referenced is not a landmine but rather an M18A1 Claymore mine. The Claymore functions similarly to a landmine, but it is not buried as a landmine is. It is placed above ground and either remotely or tripwire triggered.
It is unclear why Ben does not consider asking Chris if Chris can solely oversee the Parks Department so that Ben will no longer be Leslie's boss, which he later does for different reasons in Smallest Park (2011).