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Those countries are extensions of the US Department of Defense. Their military and economic systems have to integrate with ours.

It's good to be the largest military in your alliance, and to control the world's reserve currency.

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In what sense are Switzerland and Singapore extensions of the US DoD?

Typically, to fly with another air force you have to be able to communicate with them in the air. While Switzerland and Singapore may not be as tightly bound by treaty organizations to the US DoD as other militaries, if they have any interest in performing operations with anyone else using F-35 or its communication systems, it'll be helpful to have them themselves.

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