[rlmorel]

I prefer this strategy instead:

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

(Note: This quote has been attributed to Gen. "Mad Dog" Mattis, but...I don't know for sure)

[Lazamataz]

My version of the phrase is, "Kill everybody you meet, and while you do so, be polite and professional."

You may attribute this to me.