But as you can imagine, there is no way to provide such a power source in space. Due to the lack of a power source, the entire SDI project was abandoned. Should a future president decide to move toward a general defense against ballistic missiles, the technological options explored by SDI will certainly increase the survivability of U.S. retaliatory efforts. This will require a stable concept and process to manage the transition towards the future goal of SDI. “Our Nation and our allied nations face a variety of security challenges. Each of these challenges imposes its own needs and opportunities. Preserving peace and freedom is, and always will be, our fundamental objective. The essential purpose of our military forces, and particularly our nuclear forces, is to deter aggression based on the threat of military aggression.” Ronald Reagan, 1983