The Space and Missile Systems Center said this week it is "actively working" with Aerojet Rocketdyne on a way forward for the Air Force's investment in the company's AR1 rocket engine development effort. The service and Aerojet entered into a public-private partnership for rocket propulsion system development in February 2016. The other transaction agreement, which requires investment from industry and the government, is worth up to $536 million from the Air Force and could require up to $286 million in...