please help

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hello,
which is correct:

1. American army helicopter
2. America's army helicopter

and what's the meaning of heterogenous stones?

thanks
 

Anglika

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#1 American army helicopter.

#2 What's the meaning of heterogenous stones? What is the context? It is a term used in urology relating to the nature of kidney stones. It is also a term found in geology.
 
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