Ed Ames
Member
It was a CHP firefight. Four officers died. Training across the country began to shift afterwards. Newhall Incident. That link references a wide training revamping, but does not go into detail about the how and why.
Perhaps.
However, I think everyone should read the wikipedia page on the subject. "...a rumor that [combatant] took the time to put his spent brass casings in his pocket while reloading during the shooting - because of a habit developed on the ... shooting range - was determined to be untrue." It cites sources for that determination.