The missile only has a subsonic midphase flight, probably using a small turbofan if you're going to have a long range. Turbofans require only a lower air speed for the engine to ignite and kick in. This is unlike a turbojet that requires a higher airspeed to ignite or a ramjet that requires an even higher speed.I guess it wouldn't be either. The energy loss for a direction adjust would be minimal. Just my OCD kicks in .