Representatives from Naval Research Lab and Naval Postgraduate School speak to Marines with II Marine Expeditionary Force about a solar-powered autonomous unmanned aircraft system at the Expeditionary Energy Concepts demonstration aboard Camp Lejeune, N.C., June 24, 2015. Technology such as solar and kinetic energy-harvesting equipment was on display at the demonstration to give Marines an idea of gear they may receive in the future, and presented an opportunity for Marines to give feedback to the developers.