Newcomerstown, Ohio close to me have teachers trained and carrying. They haven't put up a sign, but it was well publicized in the newspaper for all to know. Drawing attention openly could give a shooter a slight advantage being on the look out for those armed teachers.
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I really have no position on the sign pro or con, just glad the school is taking steps to protect the future of this country. I believe children growing up with the knowledge that they had teachers around them armed to protect them that caused them NO HARM will provide them with the truth about guns. Guns in the hand of law abiding citizens is a good thing that it isn't the guns that harm anyone it is those with evil intentions that harm people with guns. A valuable lesson learned just by growing up in that environment.