EM drives have been around since the 1970's Russia. The CIA/NSA was concerned that the Russians would use that tech to travel to Mars in the early to mid 80's. However the plans for all this never happened due to unforeseen circumstances in keeping the travelers alive during the trip there and back. Now Magneto Plasma drives are used to make "anti-gravity" craft in our skies. EM is still the most current thing we have for space travel.