Thanks for the translation. I appreciate it祈武運長久 = Pray for Everlasting Luck in Battle.
Read right-to-left on your flag.
The flag is addressed to a seaman, Mr. Yamada Tokiyasu, and it looks like it was presented to him from his comrades in the same naval section. Assume the timing is sometime in the war years, however the flag itself is undated. The rest of the writing is signatures of the signers of the flag.