Which type of grenades are classified under security risk category 4?

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Illumination grenades are classified under security risk category 4 because they are designed specifically to create light, typically for the purpose of illuminating an area during night operations or in low-light conditions. These grenades are less likely to cause widespread damage compared to other types, such as hand grenades or incendiary grenades, which have the potential for causing injury and destruction. Their primary function is to provide visibility rather than to engage the enemy or destroy targets, which contributes to their lower classification in terms of security risk. This makes them valuable tools in military operations where lighting a battlefield or an area is necessary without causing the chaos associated with more destructive munitions.