PvE should have a medals system. For example ten head shots in a row, equals a head shot kill spree. One hundred kills without dieing (or going to orbit) kill spree. As you complete these you could earn marks and rep for the faction your currently representing. This next bit includes PvP as well. As you earn these medal you should then earn decals you can add to your weapons, armor, sparrows and ships. What do you think??