The Warbirds campaign is a simple linear campaign based upon the book The Warbirds by Richard Herman.  This hypothetical campaign follows an F/A-18 squadron assigned to a land base in Saudi Arabia, as it engages in air combat against Iranian ground, naval, and air forces.  The book is an excellent read and can be picked up for a buck or two at any used paperback book store.  Read the book and you will enjoy flying the campaign more.