The Air Force has begun questioning industry about existing and maturing advanced propulsion capabilities to support future aircraft requirements, according to two recently released requests for information. “The agency is considering the inclusion of on and off ramping of vendors to enable the Air Force to rapidly compete and award delivery orders or task orders to emerging and advanced propulsion technologies, materials, components and capabilities for all types of propulsion systems,” a Jan. 21 Air Force Materiel Command sources-sought notice...