Want to select all units of the same type? Find that unit and double click it quickly. To deselect all, double click slowly. How to properly defend against slow-firing missiles: Have machine guns and Gatling trucks in every corner of your interior. (Elite) Valkyries may work too, but flak tanks and flak guns can't hit missiles. As for bunkers, throw heavy gunners and stingers in them. How to properly defend against ground units: If you are up against FAVs, use elite laser tanks, laser turrets, and suicide trucks. If you are up against heavy researchable tanks, use either them, suicide trucks, or both. If the enemy is using something that can't hit air, then elite Valkyries are for you, just make sure to upgrade them as you go. Also against heavy tanks, be sure to include HF turret, plasma cannon, napalms, and mortars. Don't bother researching the Cryo, it's a low level threat as far as defense, despite its accuracy. Rocket barrages won't work either if you are being attacked by mega tanks or heavier. I tested my mega tanks on them, rocket barrages don't do tons of damage. How to properly defend against planes: Install flak guns and machine guns, as well as Gatling trucks and flak tanks. Their combined damage can shoot down any plane that crosses your path.