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I’m not saying that everyone who does advance work for a presidential event/visit is with the Secret Service, but simply that a lot of advance work is done by Secret Service personnel.
Here is a source from the USSS website:
“In order to maintain a safe environment for the president and other protectees, the Secret Service calls upon other federal, state and local agencies to assist on a daily basis. The Secret Service Uniformed Division, the Metropolitan Police Department, and the U.S. Park Police patrol the streets and parks nearby the White House. The Secret Service regularly consults with experts from other agencies in utilizing the most advanced security techniques. The military supports the Secret Service through the use of Explosive Ordnance Disposal teams and communications resources. **When the president travels, an advance team of Secret Service agents** works with host city, state and local law enforcement, as well as public safety officials, to jointly implement the necessary security measures.”
My reference to the other work the USSS does would be protection duties for former presidents, prominent presidential candidates, the vice president, and visiting foreign dignitaries.