that helmet at least to me doesn't look like a WWII
German helmet, they didn't have nose guards for a start
(the separated area to the left) which is also a bit odd if
its supposed to be the back of a helmet.
The swastika is wrong as well, the ends of the arms are cantered
out a little, like the Buddhist swastika...
but the heffalump still had me a bit baffled, as the only symbolic
elephant I could think of was Ganesh but that of course is Hinduism.
So looking into the links between Hinduism and japan I found this Wiki
http://en.wikipedia.org/wiki/Hinduism_in_Japan
And although it says that Hinduism didn't have much of
an impact, it did have an influence on Japanese Buddhism.
There was even a Japanese god
Kangiten Patron deity of Bliss and
Remover of Obstacles(my emphasis).
http://en.wikipedia.org/wiki/Kangiten
Kangiten was based on Ganesh and Ganesh's symbol was the swastika
http://www.shreeganesh.com/loving_ganesh/books/lg/lg_ch-07.html
(note particularly the shape of the swastika in the first left hand image).
I think that a Japanese Buddhist would have been quite happy to have
the elephant god, remover of obstacles and symbolized by a swastika
on his razor.