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They have the training. Many of them are still in their 40s and 50s.
In my state many middle and high schools have assigned SROs (School Resource Officers / Deputies), whose primary role is not protection, but to work with students. The secondary benefit is the presence an armed, actively trained LEO who could respond to an active shooter.
While many would decry the costs of adding these SROs to every Elementary - High School, the cost would likely be insignificant (in terms of money and effect) to turning schools into secured facilities (with prison like barriers).
http://www.tricities.com/news/local/article_a66f42d4-4806-11...
To which one of the first comments is "How are we going to pay for these SROs in Elemtary Schools now?"
My suggestion would be fewer police activities in other nations.
Nor did I think you were, but added due to other comments I have seen in the media.
What I did not add / explain in my prior post is that one LEO salary per school (a M-F 7A-3P job) is both something that could be implemented very quickly, without the time and costs associated with reinforcing schools.