http://www.auvsifoundation.org/competitions - Established by the Association for Unmanned Vehicles Systems...

http://www.auvsifoundation.org/competitions - Established by the Association for Unmanned Vehicles Systems International, the AUVSI Foundation is a non-profit organization that provides students with hands-on robotics activities designed to fuel and sustain their interest in science, technology, engineering and math (STEM). 
http://www.auvsifoundation.org/competitions