Can a particular investigator be a participant on more than one HEALICs proposal?
Yes; there is no restriction on the number of teams on which a particular investigator can participate. However, DARPA could potentially select multiple teams for awards, in which case such an investigator would be expected to meet their commitments to each of the efforts they are participating in. If a particular investigator is spread too thin, this could impact the capabilities of the teams involved to accomplish their statements of work.
