I don’t have any REC and I don’t have a good PVP fighter to earn any unfortunately.
Arena Commander’s Pirate Swarm was recently updated to be starter ship friendly. You should be able to beat a few waves on it & earn enough to improve the ship or buy a new one (defeats still reward REC). Star Marine’s REC reward has a temporary bonus at the moment as well; you get a stock loadout for that so you can start earning straight away! For FPS I personally recommend Elimination, quick and fun with all the improvements that have went in recently!
Unfortunately REC cant be earned in Singleplayer but Multiplayer Pirate & Vanduul Swarm are PvE with a coop partner!