It is not a kamikaze head band. A head band would not have two leather reinforcements in the corners, and it would likely be more oblong. Yours looks to be in the style of a typical WW2 good luck flag, but I cannot tell it if is fake or not. The various signatures have a similarity to them that is somewhat suspicious. But I really can't say with any confidence.
The vertical slogan down the side is 武運長久祈 (pray for good luck in battle). The horizontal slogan at the top is 必勝願祈 (pray for sure victory).
These are common slogans. Normally you don't see them both displayed like this, but... there are a lot of unusual things out there. The other writings on it are names.