revision preference src: The middle or inside linebacker (MLB or ILB), sometimes called the " Mike " or " Mack ", is often referred to as the " quarterback of the defense ". <SEP> tgt: One is the outside linebacker (OLB), whose job is to tackle players, rush the passer, and sometimes drop back in coverage to prevent catches. <SEP> The middle linebacker (MLB) is often called the " quarterback of the defense, " as they direct many formations and are often looked up to as leaders and very good players, mostly handling the job of tackling as well.