 Jeez. About the size, same size, as the ones the Secret Service Counter Surveillance Unit, CSU, sometimes deploy. Among the big questions in the wake of the shooting, why did the CSU not deploy one of their own at the rally? I figured they'd have those things going all the time. They certainly could have. A senior law enforcement source who has often worked with active Secret Service agents said, due to manpower constraints, they don't have enough people.