Brody Franzen is showing me his missiles and his comically large American flag. His company Furientis, operates out of Lenny Kravitz’s old studio in Los Angeles. He puts his head next to two mach three (three times the speed of light) nose cones that are browned like toasted marshmallows. “That’s from the supersonic flow hitting the nose,” he says. Franzen is the cofounder and CEO of Furientis, a defense startup that emerged from stealth with $5 million in pre-seed funding, Fortune learned exclusively. Silent Ventures led the round with participation from Bessemer Venture Partners, SV Angel, Vanderbilt University, Channel 39…