WASHINGTON (AP) — Michelle Obama has stopped by another federal agency as part of her effort to thank government workers for what they do.But the first lady says this visit was extra special.Mrs. Obama spent Wednesday morning at Secret Service headquarters, learning more about the agency that protects the first family.The first lady says the agents who protect the Obamas just like family. She says the first family sometimes even fights over who gets which agent.Daughter Sasha will complain that somebody else got Scott. Or the first lady will complain that the president got Beth.The first lady says that's "dinner table conversation" at the White House.Mrs. Obama toured classified areas of Secret Service headquarters, and told workers that they do "pretty scary" work.