The Defense Advanced Research Projects Agency (DARPA) Biological Technologies Office (BTO) is soliciting proposals that leverage biological properties and processes to revolutionize our ability to pro... The Defense Advanced Research Projects Agency (DARPA) Biological Technologies Office (BTO) is soliciting proposals that leverage biological properties and processes to revolutionize our ability to protect the nation’s warfighters. Specifically excluded is research that primarily results in evolutionary improvements to the existing state of practice.