There is a way to de-arm differnt ordanance, there is no way to universally disarm all ordannace, I would have no clue as how to dearm Garand rounds, but there is obviously a way-maybe you should just keep them as a relic...on display safely away...

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"GARRY OWEN"-Traditional war-cry of the US 7th Cavalry.
"CURRAHEE"-War-cry of the US 506th PIR.
"Everybody thinks that they are going to get the chance to punch some Nazi in the face at Normandy-and those days are over, they are long gone"-Lt Chris Burnett