The First Earth Battalion was a group of people who wanted to use creativity and non-traditional methods to solve problems, especially when it came to the military. They believed in using tools like meditation, music, and even animals to help soldiers and officers work better, and sometimes they even tried to communicate with extra-terrestrial beings.
It's kind of like if you were playing a game and you needed to find a way to get past a big obstacle, but instead of just trying to push it or climb over it, you tried things like making funny faces at it or singing a special song. The First Earth Battalion wanted to apply this same kind of imagination and innovation to the military, to make it a more peaceful and effective way of solving problems.