SAMAS power armor from my favorite pen and paper RPG called Rifts. There are a lot of robot vehicles and power armor suits in the game, but it is not the main focus of the setting (which is post apocalypse, magic and technology). They're just one way to become powerful. Others are being a cyborg, being a super soldier, being a non human, a psychic, a magician, or even just being normal and doing your best to keep up or as a support character.
Everyone posted stuff from video games, but there are more sources for robot/mecha than that.
The SAMAS suits belong to the remnants of the US government, now called the Coalition States who are xenophobic, anti magic, anti alien, kill first on sight who live only in parts of eastern Canada and the US midwest. The rest of North America is all kinds of messed up, with dinosaurs in Florida, magical cities in Ohio, a secret robot army living under Washington DC run by a malfunctioning AI computer, man sized bug aliens bugs in Minnesota, and all of Mexico is run by vampires.
Edited by Hans Von Lohman, 05 February 2015 - 11:48 PM.