Under Defense Secretary Lloyd Austin’s push to root out extremism in the military, the Pentagon issued new rules in December 2021 advising troops on banned activities, ranging from advocating terrorism to “liking” extremist views on social media. He also ordered stronger screening during the recruiting process and the creation of an investigative unit to identify potential extremists in the ranks.

https://www.rt.com/news/588407-pentagon-report-shows-rise-in-extremism-among-troops/

Liking wrong content = banned