In the "Dark Forest" book, the wallfacers are individuals selected to carry out secretive and vital tasks to defend against the alien invasion. In the modern AI community, a wallfacer could potentially be an AI system designed specifically for the task of defense against an alien invasion. The AGI strategy for defense could involve a combination of advanced technologies such as machine learning, decision making algorithms, and simulation models to evaluate and predict different scenarios. The AI system could also be designed to communicate and coordinate with other AI systems and human experts to ensure the most effective defense strategy is in place. The AI system could be programmed with values aligned with human values and the principle of minimizing harm, to make ethical decisions in unpredictable situations.
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