祝壮途
神武の軍
Congratulations on your great endeavor
The Army of Emperor Jimmu
Emperor Jimmu, according to tradition, was the first emperor of Japan.
The rest are all names. I have no strong opinion on the veracity of the flag or the writings. It is an unusual inscription. I've never seen either of those two phrases before. The names look legitimate/plausible. Unfortunately there is no other marks or writing that would clearly identify the owner or location, however some of the surnames on it are quite common to the Ishikawa Prefecture area of Japan.