[bruin66]

Used to be that most Marines knew what that sound was, and what to do when they heard it....

I've heard that you'll never hear the shot that kills you.

[Spktyr]

The "KLACK" isn't the sound of the weapon firing...

[billnaz]

"I've heard that you'll never hear the shot that kills you."

I don't know about small arms, but I am here to tell you that it probably applies to artillery rounds. Years ago I was on the range at Grafenwoehr, Germany with not a care in the world. Little did I know that way over on the other side of the impact area some idiot had improperly laid an 8-inch howitzer. When the howitzer fired the round went all the way over the impact area and impacted near my unit. We all felt the ground shake, and when I looked up I saw a big column of smoke not far away. I never heard the round come in, and I don't know anybody else in my unit who did.

[68 grunt]

You heard wrong. While that is sometimes true, it ain't always so.