It could be good in terms of CTR since users will notice that the combination of both your subdomain and domain matches the keyword.
But it wont help you for ranking purposes in the way a EMD or PMD could do. You can't compose an EMD/PMD combinig subdomain and domain because both are treated as different websites by the search engines.
Don't do it that way. You don't need to have your exact keyword in your domain name in order to rank well so I see no point in using a subdomain just to get your exact keyword in the url. Nonetheless, if you still want to use a domain that contains your keyword, use something like usarockets.com or usarocketsxxx.com (replace "xxx" with any suffix you want.
Why pinpoint it to a certain country, when you can have it worldwide? If it's a local business, then just do as lord1027 suggested above, brand the f out of it.
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