Which countries are the "closest 2-way allies of u. s." that we are their ally and they are ours? In what way?

In what way are countries allies of u. s. and who is/are closest.

In terms of money those who buy our expensive jets are "precious allies" but we wouldn't sell to north korea! Only to ally so in what way and which?

Japan
Germany
Poland
Romania
Other?
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Which countries are the "closest 2-way allies of u. s." that we are their ally and they are ours? In what way?
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