See you think you're being clever, but you're not it's common knowledge. However, since you want to try and pretend like you don't know what a military force is.
The Chunin exams arc is chapters 34 to 114 and episodes 20 to 67. You shouldn't even have to go through the whole thing because they mentioned before they even went into the forest of death and it was mentioned a few more times during the arc after that.
Boy if I have to go back and give you a chapter for something you should already know that that is ridiculous. How hard is it for you to go back and watch the Chunin exams arc? or just watch Naruto part one and even some of part two over again because those weren't the only time that the military force was ever mentioned or explained and honestly what the hell do you think they are fighting the war with right now? you fights wars with a military face, now even though I do have proof and I can post a chapter for you, part of this is just common sense now.
Prince the Military force are the Shinobi of the leave didn't you pay attention way back during the Chunin exams arc when they said that it was a way for the villages to beef up their military force? Or how they said the students at the academy were the future of the leafs military force?
Yes the 20 Kumo Ninja known the Kinkau force did kill him but he was basically already almost dead after he fought both Ginkaku and Kinaku.
The Military force is what they are using right now, that's what the ninja of the leave are the military force.
Ginkaku and Kinakau are the reason that Tobirama is dead, they were basically like Jinchuuriki it even says that after they left Tobirama basically almost dead so you who are really trying to fool around here and lastly we don't even know how strong the Kinkau force was.