Just months before the killing of four law enforcement officers in Charlotte, the director of the U.S. Marshals Service warned members of Congress about the growing threat to these officers' safety.

"Our work is exceedingly dangerous," Ronald Davis, the director of the U.S. Marshals Service, said before a House Judiciary subcommittee in midFebruary. "It requires exceptional skill and sophisticated training and equipment... Officer safety, morale and wellness have, and will continue to be one, of my top priorities. We cannot effectively serve the American people if we do not take care of our most valuable asset."

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