The Pentagon's advanced research arm intends to hold a proposers' day next month for a program that seeks to develop and demonstrate a reusable propulsion system for hypersonic aircraft that can affordably and safely transition from moving at low speeds to faster than the speed of sound. In a special notice released Friday, the Defense Advanced Research Projects Agency is calling for interested parties to attend the July 13-14 event for the Advanced Full Range Engine program, which aims to...
