Security guards routinely work in situations best described by the “three Ds of robotics” - dull, dirty, and dangerous. Sentinel robots can multiply the presence of security guards, and by doing so, reduce the costs and risks associated with a conventional security strategy. With the ability to either walk as a hexapod or skid-steer drive with four wheels, SigSent can traverse across varied terrain (e.g., sand, grass, etc.). SigSent’s walking gait can be refined through a genetic algorithm. SigSent features multiple human-robotic interaction capabilities including automated pedestrian detection, voice command, and teleoperation with a joystick controller. SigSent can also operate autonomously by following predefined surveillance routines with GPS waypoint navigation and local pathplanning. Additionally, the appropriate mode of locomotion is suggested to operators through terrain classification using the NeuroEvolution of Augmenting Topologies framework.