Mozambique Drill
The Mozambique Drill, also known as the Failure Drill, Failure to Stop drill, or informally as "two to the body, one to the head", is a close-quarters shooting technique that requires the shooter to fire twice into the torso of a target (known as a double tap or hammered pair to the center of mass), and follow up with a more difficult shot to the head that, if properly placed, should kill or otherwise stop the target if the previous shots failed to do so. History
According to anecdotal history, the technique originated with Mike Rousseau, a Rhodesian mercenary taking part in the Mozambican War of Independence (1964–1974). While engaged in combat at the Lourenço Marques Airport in what is now Maputo, Mozambique, Rousseau rounded a corner and encountered a FRELIMO fighter armed with an AK-47 at ten paces () from his position. Rousseau fired two rounds from his Browning Hi-Power pistol into the fighter's upper chest, usually enough to incapacitate or kill outright; however, seeing that the fighter was still advancing, Rousseau attempted a head shot that hit the fighter through the base of his neck, severing the spinal cord and killing him. Rousseau related the story to an acquaintance, small arms expert Jeff Cooper, founder of the Gunsite Academy shooting school, who incorporated the "Mozambique Drill" into his modern technique shooting method. The Mozambique Drill was incorporated in the Gunsite curriculum from the late 1970s. In 1980, two Los Angeles Police Department SWAT officers, Larry Mudgett and John Helms, attended pistol training at Gunsite and received permission from Cooper to teach the technique to the LAPD, and to rename it the Failure Drill (concerned that "Mozambique" might have racist overtones). Most special operations forces (SOF) were trained in the technique during the 1980s. Following the September 11, 2001 attacks, the changing nature of counterterrorism and counterinsurgency threats, and the chance of encountering suicide bomb vests, led to it being largely replaced by other techniques, within SOF units. Theory and technique
The Mozambique Drill is intended to ensure that the target is immediately stopped, by first placing two shots into the larger, easier-to-hit mass of the upper body, then, if the target is still active, following with a third, more precisely aimed and difficult head shot. Due to factors such as body armor, the bolstering effect of drugs, or failure to hit vital organs, the body shots may not be immediately effective, necessitating the third shot. To guarantee instant incapacitation by impacting the brain and central nervous system, the head shot must be delivered to the area between eyebrows and upper lip, otherwise, various bony areas of the skull could deflect the bullet. In popular culture 
The alley shooting scene in the 2004 movie, Collateral, starring Tom Cruise, is considered iconic in the gun community, as an accurate, elite level execution of the Mozambique Drill. Cruise trained for months to perfect the shooting skills demonstrated in the film. See also
Practical shooting
Stopping power

References

Techniques
Law enforcement techniques