SuperKyle

Hey guys, I'm pretty new to ArmA 2 and these forums but I love the game. I tried arma 1 for a few days and I remember a mission where you built a base and guys auto spawned and attacked the enemy. Is there a mission like that in operation arrowhead because I dont see it? Also, is there a mission like that downloadable from the community? I myself am a RTS fan and i'd love to have base vs base battles singleplayer. Thank you in advance!