The purpose of Supplement 1 is to add Specialties and Skills, and to clarify existing material. In no way is this Supplement meant to change the present game system. In Book 3 - In Country, besides new specialties and skills, there are restrictions on existing material. In Book 4 - Motor Pool, the vehicle procedure has been intensified. All and any of these changes should be applied to existing characters and campaigns. Since the basic MERC system remains the same, these changes are only to add authenticity, realism, and action to your game.