The lease onGuantanamo dates from 1903 before the revolution and has a clause that it can only be recinded with the agreement of both parties - something the US is not about to agree to.
Apparently Castro has a drawer full of US cheques for the lease payments. He has never cashed any of them.
http://en.wikipedia.o...i/Guant%C3%A1namo_Bay
American involvement in Cuba is contraversial especially the American Protectorate and puppet governments that were installed there