This paper outlines the design and implementation of the Mobile Autonomous Robotic Sentry (MARS) unit with facial detection and recognition capabilities. MARS patrols its surrounding area, performing obstacle avoidance and searching for human threats using facial detection. Once a threat has been identified, MARS will aim at its target and fire projectiles. In addition to facial detection, MARS can be trained to recognize specific faces and identify them as threats or non-threats. The robot platform consists of two circular pieces of wood, approximately 30cm in diameter. These pieces are attached flat and parallel to each other, forming a two-piece platform onto which parts can be mounted. MARS is shown fully assembled in Figure 2
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