Marines were not in MOG. It was US Army, Rangers, Delta, 10th mountain.
In the mid 1980's we had a group of robbers operating in Ft Worth, Tx. They would hit grocery stores during daylight and execute witnesses. I knew then and there that I was not gonna knee or lay down for a bullet. I trained my wife and bought her a holster purse even though there was no CC in Texas at the time. I carried 3 pistols on/off duty. S&W 686 6", 2.5" and a Colt Officers model 45. My wife carried a Beretta 380 model 84. Her job was to take care of the baby and stay in my view, but to get away from me. I told her that when I made my move everyone would be shooting at me. My plan was dynamic, explosive violence focused on BG's.
You need to master your gun, carry enough gun and have a plan.