In April 2007 Blue Angels pilot Lieutenant Commander Kevin Davis went down in his F/A-18 Hornet during a maneuver in an air show held over Marine Corps Air Station Beaufort, South Carolina. He was killed in the crash, and the ensuing investigation led officials to conclude that Lieutenant Commander Davis had suffered a blackout due to a brief loss in "situational awareness" while pulling his aircraft into a particularly tight turn.
In other words, it was not the aircraft, but Lieutenant Commander Davis' physiological response, that probably led to his fatal crash.
The greatest limiting factor in military combat aircraft is the pilot. Today's planes fly faster, higher, and farther than ever before, yet the human body still has maximum force and endurance thresholds that cannot be increased. One of the body's most critical deficiencies is its inability to tolerate high inertial forces, or G-forces. These are the acceleration or deceleration forces that the body experiences when its path of motion changes. Fortunately, the body is capable of adapting to G-forces—to a point.