This section heading made me chuckle:

Be Polite, Be Professional, But…

Source: https://warontherocks.com/2018/03/what-to-expect-when-youre-expecting-the-pla-a-guide-to-meeting-with-the-chinese-army/

https://en.wikiquote.org/wiki/James_Mattis:

Be polite, be professional, but have a plan to kill everybody you meet.