You seem to be a good Japanese reader and I love it, edteach
I need a few more pictures of part A and B taken from different angles to reconfirm but the flag can be read like this roughly.
1. 八紘一宇 We are all one
2. 武運長久 松井 Continued luck in the fortunes of war by Matsui
3. 内閣恩給局 所一会 忠烈 井田一郎 To Tokoro, Ichie of the Cabinet Pension Bureau / Unswerving loyalty by Ida, Ichiro
4. 頑 速水 Absolutely by Hayami
5. 猛 宮村勝田 Ferocious by Miyamura, Katsuta
6. 押 女+丙 (a coined word) 属 井川 You are a playboy by Igawa (sounds same as 横柄属 Oh-hei-zoku = Arrogant guy)
7. 勲 津田利之 Distinguished service by Tsuda, Toshiyuki
8. 断 伊藤少尉 Cut by 2nd Lt. Ito
9. 滅私奉公 吉川少尉 Selfless devotion by 2nd Lt. Yoshikawa
10. 義 大西中尉 Justice by Lt. Onishi
11. 勇 中町大尉 Bravery by Capt. Nakamachi
12. 常勝 松田義一 Ever-victorious by Matsuda, Yoshikazu
Hope this helps.