What area does the only floating zip code in the US cover?

Question

What was the only combat medal created in the US, and subsequently cancelled in April 2013, for a military service member who is not physically in the geographic combat zone?

Answer 1

The J. W. Westcott II in Michigan and the ships it services
The boat operates out of Detroit, Michigan, and delivers mail to ships while they are underway on the Detroit River to and from the Great Lakes (the Detroit River connects Lake St. Clair and Lake Erie.). The US postal zip code 48222 is exclusive to the floating post office and its ship addressees.