Is it really a surprise?
https://www.theguardian.com/world/2012/feb/09/us-military-marines-nazi-ss-flag-photo
https://www.vice.com/en/article/marines-neo-nazis-military/
https://www.theguardian.com/us-news/2025/apr/14/us-military-extremism-the-base
And I've only looked for 30 seconds.