Zero Hour
The first section kicks off with you taking a direct hit from an anti-infantry round, nasty little kicker, but strangely enough there's a bacta station. They are found regularly throughout the game, sometimes more often then others, and most often before major encounters.
The first of your squad that you meet up with is demolitions man Scorch. He has just scrapped a couple of tinnies. After blowing the blockade continue on into the enemy outpost where Fixer awaits you. He just kills a Genosisian as you come into range. Finally after him Sev, the marksman or sniper, who comes in handy quite often. Your immediate target is Sun Fac, not an easy bug to catch, but once Sev shoots him down, he's dead.
Things go south again as the Advisor reports that Delta must assume Theta's foundry mission. It seems they were taken out watching Delta's six, which ties into Hard Contact where Darman is the only Theta survivor. At any rate its on to the foundry, which in contrast with lies ahead is not worst of what's to come for Delta. The crippling of foundries pivots the surface battle against the CIS, which helps the stalemate for the GAR.
The Core Ship is the climax and ender to the mission on Geonosis for Delta. It will not be a straight shot from one end to the other unless you are extremely tactical in every move. In the end, the bridge will be a death trap, but you will get out of there to fight another day. The missions only become more insane after this. War has come to the Galaxy and for you the fight is only beginning now.