Balloons are a gold unit of S1914, and are tools for reconnaissance and can largely improve the range of sight of ground units, but they possess hardly any attack or defense strength. Thanks to their high range of sight you can detect enemy units much easier and faster. The same applies for targets for your high range weapons (artillery, railguns, and airplanes). The range of sight is equal to the operation range of railguns which makes them a good combination. Balloons are very vulnerable to any kind of enemy fire, especially to attacks using airplanes.