First lady Jill Biden surprised National Guard members at the U.S. Capitol on Friday and delivered cookies, a gesture of kindness "for keeping me and my family safe" during President Biden's inauguration earlier this week. 

"I just want to say thank you from President Biden and the whole, the entire Biden family," she told a group of Guard members in her first public appearance since assuming her new position.

"The White House baked you some chocolate chip cookies," she said, before joking that she couldn't say she had baked them herself.

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Saying, "The Biden's are a National Guard family," first lady Jill Biden greets members of the National Guard with chocolate chip cookies, Friday, Jan. 22, 2021, at the U.S. Capitol in Washington. (AP Photo/Jacquelyn Martin, Pool)

Nearly 25,000 troops descended on Washington, D.C., in the days leading up to the inauguration, as officials remained on heightened alert for rouge actors looking to stir up violence. The ultra-defensive posture came after rioters stormed the Capitol building earlier this month in protest of Biden's presidential victory. 

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Jill Biden's visit with the National Guard was particularly sentimental to her as she reminisced about her late step-son Beau Biden, a former Delaware Army National Guard member who spent a year deployed to Iraq. He later died in 2015 at the age of 46 after being diagnosed with glioblastoma, a rare form of brain cancer.

"So I'm a National Guard mom," she told the crowd, adding that the baskets were a "small thank you" for leaving their home states and coming to the nation's capital. President Biden offered his thanks to the chief of the National Guard Bureau in a phone call Friday.

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"I truly appreciate all that you do," the first lady added. "The National Guard will always hold a special place in the heart of all the Bidens."

The Associated Press contributed to this report.