The funny part is, in the Light Novel, the Military dislike politics because as they say "if the politicians had done their jobs properly, we wouldn't be dealing with this situation."
And well, it makes sense, like Tanya once said not the actual quote, but similar in intent to what she said, War is just an extent of politics and negotiations, but the least effective one, in which human capital is spent in large quantities, making it a huge waste of human resources.
Or her talking about being a soldier is like any other job, but instead of delivering paperwork, or selling goods, you neutralize enemies, and the more results you provide, the higher are your odds of getting a promotion, and the more satisfied your employer will be.