"Lawnmower" is a mission where you train, improve, and test your helicopter landing skills. Request a landing by difficulty (easy, normal, or hard), and the mission generates an LZ based on your request. LZs are generated dynamically, from tens of thousands of possibilities, virtually guaranteeing that no two missions are identical (unless you are unusually patient). Landings are rated individually, and after five or more consecutive landings, your overall skill is rated as well. Harshly. So better step up your game, soldier!