Presolicitation notice from the DEPT OF DEFENSE, DEFENSE ADVANCED RESEARCH PROJECTS AGENCY (DARPA), DEF ADVANCED RESEARCH PROJECTS AGCY. The notice is for the Advanced Research Concepts (ARC) program, which aims to solicit and explore a high volume of promising new ideas for limited-scope investments. The program will focus on answering high-risk/high-reward fundamental research questions and assessing the impact of further investment on problems of importance to the Department of Defense.