In the short term at least, it sounds like good news that Japan may rearm itself in response to North Korea's nuclear saber-rattling. But I keep remembering Tom Lehrer's classic "MLF Lullaby". The MLF, or multilateral force, was a US proposal during the Cold War. Submarines and warships armed with nuclear missiles would be manned by international NATO crews -- including Germans. Quoth Lehrer:
Sleep, baby, sleep, in peace may you slumber
No danger lurks, your sleep to encumber
We've got the missiles, peace to determine
And one of the fingers on the button will be German....
Once all the Germans were warlike and mean
But that couldn't happen again
We taught them a lesson in nineteen eighteen
And they've hardly bothered us since then....
(Follow the link for the full lyric.)