Bill

William "Bill" Overbeck is one of the four playable Survivors in Left 4 Dead. He is a Vietnam veteran who served in the U. S. Army 1st Special Forces Group, and is the oldest of the group. He is usually seen wielding the M16 Assault Rifle (which appears as the M16A2, a real-life assault rifle used by the U. S. Military after the Vietnam War).

Bill served 2 duties during the Vietnam war, during which he suffered a knee injury due to shrapnel boring into his knee, causing permanent damage. Two days after the first Infection, Bill was at a veterans hospital waiting for an operation, possibly relating to his knee injury. While waiting, a resident staff member attempts to make small talk with Bill regarding Bill's missing family and smoking habits. Bill then brushes him off, telling him to go practice somewhere else.

As Bill dozes off from the surgery anesthesia, one of the nurses turns due to infection and kills the operation room staff. Bill somehow staves off his oncoming unconsciousness through sheer force of will as he simultaneously fights off the infected nurse, disabling her momentarily. Defending himself with bonesaw and knife, Bill fights the sudden horde of infected outside the hospital. Back home, Bill takes out his old military fatigues, ready for war.