Don't worry about getting stuck out on some bumfudge planet on the outer reaches of the Mullet System playing the same search and destroy missions over and over and over again. Mercenaries features a completely dynamic campaign, so you're never locked into a set series of missions. New planets will open up multiple missions, so you'll never be at a loss for something to do. Even if a certain mission is particularly difficult and you're too low on C-bills to jump to the system you, you can just opt to complete one of the easier missions on the planet you're on and earn some cash.