Sometimes they are used to breach walls of buildings to provide alternative entry points. They also are useful for providing bulletproof cover when a SWAT breac

Sometimes they are used to breach walls of buildings to provide alternative entry points. They also are useful for providing bulletproof cover when a SWAT breaching/entry team is approach a building. Though a department doesn't need many. And, they could be shared within a county or metro area rather than every department having their own.