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Bomb disposal is a term for making explosive devices safe by disarming or detonating them.
A bomb squad is a police unit (in the US), specializing in the disarming of explosive devices planted by criminals or terrorists.
Several techniques may be employed in the rendering safe of a suspected explosive device. These include the use of X-ray imagers, remotely controlled robots, and bomb blankets.
One of the most common methods used in bomb disposal include having a robot pick up a suspected bomb so it can be removed to an isolated/shielded location where it can be detonated with a minimum of damage. If it has been determined that the device may not be moved safely, many robots are capable of firing a shotgun shell or water cannon in an attempt to either detonate or disrupt the device. Water cannons, also known as disruptors, can also be used without a robot by supporting them on a small stand, and may be used to sever wires or other components in an attempt to prevent detonation.
Attempts to defuse devices manually will typically only be tried when remote methods are not feasible. As protection, the person in question usually wears a heavy specialized suit made of kevlar and ceramic with a polycarbonate face shield, all of which can increase the person's chance of survival should the device explode, but the hands are usually exposed to allow for maximum manual dexterity in the task.
The military term Explosive Ordnance Disposal, can be defined as: "The protection of people, resources, and the environment, by eliminating or reducing the threat posed by explosive, chemical, incendiary, nuclear, or biological ordnance and other hazardous explosive situations, including improvised explosive devices,(IEDs)". EOD units offer detailed technical advice and expertise that will promote rational, informed, sound, and competent decisions. Specialized EOD procedures may be performed during the recovery of an accident or incident, enabling commanders to return operations to normal in the minimum amount of time.
If the item creating the problem isn't handled effectively on the first attempt - the result is total failure or total devastation of the surrounding area...and possible death of the personnel involved.
The "crab" as it is commonly referred to, is the only joint service badge. It can only be worn upon successful completion of the course at the US Navy School of Explosive Ordnance Disposal.
The Wreath: Symbolic of the achievements and laurels gained in minimizing incidents through the ingenuity and devotion to duty of its members. It is in memory of those EOD people who gave their lives while performing EOD duties.
The Bomb: Copied from the design of the World War II Bomb Disposal badge, represents the historic and major objective of the EOD mission, the unexploded bomb. The three fins represent the major areas of nuclear, conventional and chemical/biological interest.
Lightning Bolts: Symbolizes the potential destructive power of the bomb and the courage and professionalism of EOD personnel.
The Shield: Represents the EOD mission -- to prevent a detonation and protect the surrounding area and property to the utmost.