Raytheon has a four-bin(Far exceeds, Exceeds, Meets, and needs Improvement) ranking system that, while officially not a stack-ranking system, unofficially is because managers are under significant pressure to have their sections roughly meet corporate's expected rating distribution. The system is not a total clusterfuck because the "I" category, which gets you put on a Performance Improvement Plan, is allowed to have nobody assigned. A manager still needs to respect the E and F targets, though, so awesome sections end up screwing people over and mediocre sections end up rewarding people who don't deserve it.