I asked the same question when I joined. This game has history. So you can not just delete teams, because that way you delete history. You can not make a new team every time a user joines. The old teams may have sold some soldiers that still play, thus you can not delete their history. You are just another manager that tryes to start up a team that has gone bankrupt.
Perhaps we could bold up all the history that is connected to the current team?