What is “high” about the US military? You did not include enough words to clearly communicate what you are asking.
If you are asking why the budget is high? It is not in comparison to other nations. The US spends 3.1% of our GDP on its military. Yes that is more than our treaty obligations of 2% but it is in the same zone (slightly less) than the percentage Russia spends on their military. Russia is still considered our largest rival.
If you are asking about physical size. That is because we are the last remaining Super Power and thus must maintain a military large enough to react globally in case any other nation tries to rise to the level of Super Power, to defend trade lanes int he oceans, and to intervene in foreign wars either when requested or when it is to our interests.
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