Special Forces Mysterious Force

Do you know about the mysterious special forces unit, the mysterious fifth unit, those non-existent shadow units, those war machines? What is an army? Brothers, the army has a hard body in the past. What do you want to see, is it hot blood or a harem? Ahem, my book has no harem, only hot blood, only training, fighting, and brotherhood. All of them have flesh and blood. Enter my world. I will show you what the mysterious army looks like in my world. Is it a shadow or a machine or is it without flesh and blood? This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.