Whatever alien life looks like, the US Government already has forms ready: G-731, Inquiry About Status of I-551, Alien Registration Card at http://uscis.gov/graphics/formsfee/forms/g-731.htm
Oh, and see the Alien Registration Act at http://uscis.gov/graphics/aboutus/history/attachd.htm
Quote:
Alien Registration: Specimen Form
Sample forms distributed to aliens to gather the information required and fill out in draft. When they appeared in person at a post office for registration, the information on the specimen form was transferred to the official registration form
And, yes, I'm a registered alien according to the US Government, even got my very own number 
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There are two types of vessels, submarines and targets.
