Abstract: An amphibious vehicle for traversing land and bodies of water includes a chassis, and a cycloidal propeller coupled to the chassis and which includes a plurality of cycloidal propeller blades rotatably coupled to the chassis and each extending parallel a rotational axis of the cycloidal propeller, and an extension/retraction system configured to extend the plurality of cycloidal propeller blades away from the chassis and to retract the plurality of cycloidal propeller blades towards the chassis.

Abstract: A training system that provides web-based distribution, centralized control of pedagogy consistency and content customization, and efficient and economical resource utilization via group oriented training in which a plurality of trainees can be trained without the overhead of providing each trainee with an individual PC. Because the proven education delivery method includes entertaining situational modeling videos, game playing, and a high degree of interactivity, it assures high trainee comprehension with a minimum investment in hardware and instructor overhead.