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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Darius Robinson was relieved of coaching duties after his arrest, the Greene County School District said. (Greene County Schools)

Credit: Greene County schools

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Waymo autonomous vehicles operate across 65 square miles inside I-285 and have been involved in six incidents with Atlanta Public School buses since May. Waymo issued a recall because of their cars briefly stopping or slowing down before continuing forward while a bus was stopped and flashing its lights. (Courtesy of Atlanta Public Schools)

Credit: Courtesy of Atlanta Public Schools