There was another lease, which was perpetual, signed with Cuba after that. See the link I posted. [1]
"A 1934 treaty reaffirming the lease granted Cuba and her trading partners free access through the Bay, modified the lease payment from $2,000 in gold coins per year to the 1934 equivalent value of $4,085 U.S. dollars, and added a requirement that termination of the lease requires the consent of both the U.S. and Cuban governments, or the U.S. abandonment of the base property."
> Can you point to some less biased source than the US military?
Yes. I called the 1934 document a lease, but it was actually a treaty that also included a modified form of the earlier lease's provisions.
In 1934, a new Cuban-American Treaty of Relations,
reaffirming the lease, granted Cuba and its trading
partners free access through the bay, modified the lease
payment from $2,000 in U.S. gold coins per year to the
1934 equivalent value of $4,085 in U.S. dollars,
and made the lease permanent unless both governments
agreed to break it, or until the U.S. abandoned the base
property. [1]
United States - Cuban Agreements and Treaty of 1934 [2]
Cuban–American Treaty of Relations (1934)
Yale Law School, Lillian Goldman Law Library [3]
Cuban–American Treaty of Relations (1934) [4]
"A 1934 treaty reaffirming the lease granted Cuba and her trading partners free access through the Bay, modified the lease payment from $2,000 in gold coins per year to the 1934 equivalent value of $4,085 U.S. dollars, and added a requirement that termination of the lease requires the consent of both the U.S. and Cuban governments, or the U.S. abandonment of the base property."
[1] https://www.cnic.navy.mil/regions/cnrse/installations/ns_gua...