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Perimeter security glossary - M
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M
M700 Time Fuse
A Military fuse, the M700 has a black powder core and is incased in dark green plastic with yellow bands at regular intervals
Mail Bomb Delivery Tactics
Delivery of bombs or incendiary devices in letter or packages. The bomb sizes involved are relatively small. The aggressor's goal is to kill or injure people. See Bomb.
Main Charge
The main and normally the largest explosive charge of a mine or ammunition. Normally initiated by either the detonator or a booster charge. See Detonator, Explosive, Mine.
Man Portable
A weapon or other item of equipment that can be carried by a single soldier without preventing them from functioning effectively.
Manmade Disaster
A disaster that man clearly causes, such as wars, armed conflicts or civil strife. All other disasters, with the exception of technological disasters (e.g., industrial accidents, railway crashes) are labeled natural. All avalanches, floods, landslides, droughts, crop failures, etc., are thus given the same quality of naturalness as earthquakes, tropical cyclones and volcanic eruptions. See Disaster, Emergency, FEMA, Natural Disaster.
Mantrap
Enclosure that prevents access into a secure area by trapping the individual inside the enclosure until access has been authorized.
Manual Retractable/Semi-Automatic Bollards
Non-automatic bollards that are most suitable for less used entrances and exits and are more cost-effective than the automatic bollards. Often paired with high-security gates or barricades.
Marker
A device or a taggant placed into an explosive material that has utility after an explosion to identify the manufacturer, the date, and shift when it was manufactured. See Taggant, Identification Taggants.
Mass-Detonating Explosives
High explosives, black powder, certain propellants and pyrotechnics, and other similar explosives. They may be alone or in combination, or loaded into various types of ammunition or containers. Most of the entire quantity can explode instantaneously when a small portion is subjected to fire, to severe concussion or impact, to the impulse of an initiating agent, or to the effect of a considerable discharge of external energy. Such an explosion will generally cause severe structural damage to adjacent objects. The explosion may cause detonation of other items of ammunition and explosives, stored near enough to (and not adequately protected from) the initially exploding pile, so that the two or more quantities must be considered as one for quantity-distance (Q-D) purposes. See Black Gunpowder, Detonation, Explosion, Low Order Detonation.
Mass Notification
Capability to provide real-time information to all building occupants or personnel in the immediate vicinity of a building during emergency situations.
Master Timer
A device that develops basic timing signals for a terminal.
Match Bomb
An incendiary device consisting of a lighted cigarette placed between the cover of a pack of safety matches and the match heads. When the cigarette burns down and reaches the match heads, a small fire is produced. The match bomb is typically surrounded by highly combustible materials and is often used by arsonist who wants to be well away from the area when ignition occurs.
Match Head Bomb
An explosive device consisting of match heads packed tightly into a fragmentable container, such as a short length of pipe capped at both ends and drilled to allow insertion of a fuse.
Maximum Instantaneous Charge (MIC)
Mass of explosive detonating in some defined time period, usually 8 milliseconds. See Explosive.
Mechanical Breach
A breach method that requires increased physical exertion by one or more soldiers using hand tools such as axes, saws, crowbars, hooligan's tools, or sledgehammers. The mechanical breach is not the preferred primary breaching method because it may be time consuming and defeat the element of surprise. See Ballistics Breach, Breaching Method, Explosive Breach.
Mechanical Fuse
A fuse in which some form of mechanical energy is utilized to cause the fuse to function. In its simplest design, it consists of a striker (firing pin) held away from a detonator by a retaining spring until some external force is applied. When sufficient force is exerted to overcome the retaining spring, the striker is allowed to impinge on the detonator, initiating the firing train. See Detonator, Fuse.
Mechanical Initiator
Any mechanical device used to initiate a bomb's detonator. A mousetrap and coil spring are common types of mechanical initiators. See Bomb, Detonator.
Medical Transitional Structures and Spaces
Structures that are erected or leased for temporary occupancy to maintain mission-critical medical care during construction, renovation, modification, repair or restoration of an existing medical structure. Examples include urgent, ambulatory, and acute care operations.
Medium Cargo Transport Unit
Standby forces standard component; provides medium cargo transport beyond the self-sufficiency of military units, and maintenance to unit-owned vehicles.
Mercury Switch Bomb
A bomb that explodes when an electrical circuit has been opened or closed by the action of a mercury switch. A bomb of this construction is designed to detonate when moved. See Bomb.
Metalith™
An engineered corrugated steel revetment, or bin revetment, protective barrier system designed as a blast mitigation and/or blast containment barrier. The Metalith barrier system has also been certified by the Department of State as a K12 barrier, its highest anti-crash rating. The Metalith corrugated steel revetment system is made from 16-gauge and 18-gauge steel panels. See A-1 Revetment, Anti-Ram Vehicle Barrier, B-1 Revetment, Blast Mitigation, Blast Wall, Corrugated Metal Revetment, Expeditionary Earth Filled Protective Barriers, K12.
Metric Ton
2,204.6 pounds or 1,000 kilograms.
Microwave Sensor
A sensor that detects the movement of a person or object through a pattern of microwave energy. Microwave sensors which use the Doppler Effect to recognize movement within a protected area (monostatic sensors) are most effective for indoor applications. Microwave sensors employing the beam break principle (bistatic) are often used in outdoor applications. See Motion Detector, Motion Detection, Motion Detection Alarm.
Military Demolition
The destruction by fire, water, explosive, mechanical, or other means of area structures, facilities, or materials to accomplish a military objective. Demolitions are explosives used for such purposes. Demolitions have offensive and defensive uses. Examples are the removal of enemy barriers to facilitate the advance and the construction of friendly barriers to delay or restrict enemy movement.
Military Installations
Army, Navy, Air Force, and Marine Corps bases, posts, stations, and annexes (both contractor and Government operated), hospitals, terminals, and other special mission facilities, as well as those used primarily for military purposes.
Military Munition
The term military munitions includes: confined gaseous, liquid, and solid propellants, explosives, pyrotechnics, chemical and riot control agents, smokes, and incendiaries used by DoD components, including bulk explosives and chemical warfare agents, chemical munitions, rockets, guided and ballistic missiles, bombs, grenades, demolition charges, and devices and components thereof. Military munitions do not include wholly inert items, improvised explosive devices, and nuclear weapons, nuclear devices, and nuclear components thereof. However, the term does include non-nuclear components of nuclear devices, managed under DOE's nuclear weapons program after all required sanitization operations under the Atomic Energy Act of 1954, as amended, have been completed. See Bomb, Explosives, Grenades.
Military Working Dogs (MWD)
Specially trained military canines used as bomb sniffers, rescue dogs, and other military activities. Millisecond
1/1000th of a second.
Mine
An explosive weapon that is hidden underground or water and triggers when an individual or vehicle moves over it or nearby. Mines are often placed in groups, forming a minefield. Due to the use of mines most nations now operate specialist mine disposal teams in their armed forces. See Claymore Mine.
Minimum Essential Infrastructure Resource Elements
The broad categories of resources, all or portions of which constitute the minimal essential infrastructure necessary for a department, agency or organization to conduct its core mission(s).
Mitigation
The activities designed to reduce or eliminate risks to persons or property or to lessen the actual or potential effects or consequences of an incident. Mitigation measures may be implemented prior to, during, or after an incident. Mitigation measures are often informed by lessons learned from prior incidents. Mitigation involves ongoing actions to reduce exposure to, probability of, or potential loss from hazards. See Blast Mitigation, Blast Mitigation Action Group (BMAG), Blast Mitigation Products.
Mitigation, Hazard
See Hazard Mitigation.
Mixed Oxide Fuel (MOX)
Nuclear reactor fuel composed of plutonium and uranium oxides. Using plutonium reduces the amount of enriched uranium needed for fuel.
Mortar
An indirect fire weapon used by the artillery.
Motion Detection
Detection of an intruder by making use of the change in location or orientation in a protected area as the intruder moves around. In video motion detection, this means changes in key parameters of a viewed scene from a recorded reference image of that scene. See Motion Detection Alarm, Motion Detector.
Motion Detection Alarm
A system that works on the principle that any motion in an area will upset an established balance and cause an alarm to be given. A motion detection alarm is usually based on the use of ultrasonic or radio frequency sound waves. See Motion Detection, Motion Detector.
Motion Detector
Intrusion detection sensor that changes state based on movement in the sensors field of view.
Motion-Initiated Bomb
A bomb engineered to explode when it is moved. It is usually constructed so that movement brings objects or elements into contact, e.g., hypergolic chemicals or contact wires. The motion-initiated bomb is a type of booby trap. See Bomb, Booby Trap.
Moving Vehicle Bomb
An explosives-laden car or truck driven near or into a facility and detonated. The aggressor's goals are to damage or destroy the facility or to kill people. This is a suicide attack. See Active Barrier, Vehicle Barrier, Anti-Ram Vehicle Barrier, Car Bomb, Passive Barrier, Vehicle Stopper.
Multiple Rocket Launcher System (MRLS)
A rocket launch system with the capability to fire salvos.
Munroe Effect
The focusing of the force produced by an explosion resulting in an increased pressure wave. See Blast Wave, Shock Wave.
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