Then again, a good commando team can easily take out a GenCore or two and the invasion and/or bombardment of the planet begins. Granted, that route takes time, it's still achievable. I only arm VERY important planets with GenCores, the rest have LNRs and LOTS of troops (along with at least 2 Star Destroyers in orbit). That way, if an enemy flet gets past the space defenses, they still have to fight past an LNR (if they choose to bombard) and MANY ground troops. Along with that, I make sure to keep at least 3 squadrons of fighters on the ground and the fleets to full with fighters and troops . . . you know: just in case.