[grofvuri]

On the flag of the soldier Yano Saichii ( 矢野才一君 ) there are no dates nor any place name. Only short auspicious messages accompanied with the names of relatives and friends.
But some useful elements are nonetheless present.

We find in big letters on the right “Shuku nyudan” ( 祝入團 ), that rougly translates to "congratulations on your enlistment". And we find also a smaller "Kaigun danji" ( 海軍男兒 ) here: http://img165.imageshack.us/img165/3...undanjizq4.jpg , which is the proof that Yano san was enrolled in the “Dai Nippon Teikoku Kaigun” ( 大日本帝國海軍 ), the Imperial Japanese Navy. That because differently from the Navy, soldiers enrolled in the “Dai Nippon Teikoku Rikugun” ( 大日本帝國陸軍 ), the Imperial Japanese Army, got send-off banners with written on the phrase “Shuku nyuei” ( 祝入営 ), that rougly translates to “congratulations on entering the service”.

So, for what I can deduct with my limited knowlede, there is no evidence here to presume that this flag is in any way connected with the “Shinpū Tokubetsu Kōgeki Tai” ( 神風特別攻撃隊 ).

I spent quite some time for this short research, reading through kanji, unstacking books from the higher shelves of my library and such; but I believe that it is worth and deserving to try to aid you guys in the noble intent to bring the banner back home to the descendents of the soldier Yano Saiichi.
So good luck with your quest.
And keep us posted. Thanks.