Moreover, it seems that small Japanese children are allowed to wander about military or government installations at will and eavesdrop on adults...
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Yes, this is a very serious problem which the SDF has tried to address on numerous occasions to no avail.
One of the most egregious examples is detailed in the Toho documentary, "Godzilla Against Mechagodzilla" -
<http://www.tohokingdom.com/web_pages/dvd/gxmg_tristar.htm> -
Of course, everyone knows the story by now from the multitude of news accounts: a giant robo, constructed around the bones of the first Gojira (killed by the oxygen destroyer in 1954) decisively drives back the atomic lizard threat from Japan using the absolute zero ray.
Shockingly, the SDF facility that housed both MechaG, its engineers, crew personnel and science team was the playground of a precocious 8 year old girl who made quite nuisance of herself.
.d.