The offense utilizes a short, precise, timed passing game as a replacement/augmentation of the running game. The offense is extremely difficult to defend against as it is content to consistently make 6–8-yard gains all the way down the field. (The other West Coast offense—more focused on the vertical, or downfield, passing game—was actually created by 1960s L.A. / San Diego coach Sid Gillman, and San Diego State coach Don Coryell, who also employed a version of it as head coach of the St. Louis (football) Cardinals and San Diego Chargers during a period where it garnered the nickname "Air Coryell".)[16]