text: In reply to message48756: Everybody here is gonna think how stupid I am. So I was 11 Charlie and one of the 1st few times that we were doing a live fire exercise. I decided I would not duck my head when I dropped around in the tube and would just watch it come out of the tube. Not realizing that concussion came out of the tube also. I got rocked and it knocked my equilibrium off for a while.