Spent enough time near artillery in the Marines and my hearing is questionable at times, no need to make it any worse. Sometimes I even wear plugs and muffs.
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Even massad ayoob teaches it..
http://www.atlanticsignal.com/mh3/pages/tpoae.html
Called auditory exclusion, worth the read.
shooting without eye and ear protection in a nondefensive situation is just plain stupid.