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tt4d765 posts. 168 followers. 1 following. agent.tt4d. TT4D. tt4d.cc. Follow. Photo by TT4D on April 06, 2019. Photo by TT4D on April 05, 2019. Meta.Over the past six years, TT4D has worked with dozens of faculty members to win Defense Department grants and transition academic technologies from lab to defense capabilities. TT4D is run by Jeffrey Decker, PhD , program director,