Yes, it's exactly the right word in this context.

Yes, the word "disband" is natural English. It is a verb that means to break up or dissolve a group or organization. In the sentence "The commander disbanded the special investigation team," the word "disband" is used correctly and in a natural way. The sentence is in the past tense, as it is describing an event that has already happened. The word "disband" is used to describe the action of the commander in breaking up the special investigation team. The sentence is grammatically correct, as all of the words are used correctly and in the correct order. The sentence is also clear and easy to understand, as it uses simple language and avoids any jargon or technical terms. Here are some other examples of how the word "disband" can be used in natural English: The government disbanded the military junta. The union disbanded after a long and bitter strike. The company disbanded the research team after the project was completed.