Konnichiwa TreeCream-san!
The big letter "勇義" means courageous and loyal. "出征" means departure to war. "祝吉見君" means celebrate 吉見(Yoshimi:name)
The repetition of kanji is "御奮斗" and "御健康". These kanji are not names.
"御奮斗:Gofuntou" - Mustering up courage to face difficulties.
"御健康:Gokentou" - Good health.
It says to fight hard and take care of your health.
And the "子" at the end of the sentence represents part of the name.
Unfortunately, it is not a genuine good luck flag, so the information written on it has no value.
NANGI