Someone in Biden's earpiece told him to salute the marines, and Biden just repeated the words "salute the marines," because he is so used to just repeating what comes from his earpiece.

The marines were not saluted.

https://twitter.com/elelephantes/status/1352338002752638976?s=21

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In response Other Half to her Publication

🤡Oh, man!

In response Other Half to her Publication

😂🤣