Alameda County Sheriff's Office SWAT Team participates in a training exercise during Urban Shield 2013. Photo by Jake Nicol.

“Urban Shield is the largest full-scale exercise in the nation,” said Sgt. J.D. Nelson, Alameda County Sheriff’s Office (ACSO) public information officer. The event was created by ACSO seven years ago and has grown each year. This year, Nelson estimates that more than 5,000 people participated from across the state, country and world.

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