Friday was the first day of school in many parts of the United States, and while the levels of excitement varied among students, it was also evident among police resource officers.

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Several police departments, using the hashtag #SROchallenge, posted photographs on social media of their staff members who were going back to school.

Here are a few examples.

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Martin Luther King Jr. Day and Juneteenth, among others, will no longer be considered fee-free days at U.S. National Parks. While the MLK National Historic Park in Atlanta doesn't charge admission, the new schedule will affect such metro Atlanta sites as Kennesaw Mountain National Battlefield Park. (Miguel Martinez/AJC)

Credit: Miguel Martinez-Jimenez

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Jo'wan Bellamy taught in the GNETS program for 17 years and recently transferred to Atlanta’s new behavioral program at Crawford Long Middle School. (Arvin Temkar/AJC)

Credit: arvin.temkar@ajc.com