GOOD NAME: ‘Mayhem’ Will Be Larger, Multi-Role Air-Breathing Hypersonic System for USAF. “The new missile would be an air-breathing system—unlike the boost-glide ARRW—but would still use a solid rocket booster to accelerate to hypersonic speed. The Air Force wants to get to preliminary design review within 15 months, suggesting it already knows the capabilities offered by the three companies and believes the technology is already largely mature.”