R.I. Gen. Laws § 1-2-15: Leasing for purposes of national defense.

The airport corporation may lease to the United States government or agencies of the United States government, when the lease concerns matters of national defense or aviation safety or convenience, any portion of any airport or landing field or any of the buildings or structures on the airport or landing field for a period or periods not to exceed fifty (50) years; the lease to be executed by the president and CEO containing any reasonable conditions, rules, restrictions, and regulations as the president and CEO for airports deems suitable or necessary and be approved as to substance by the director of administration and as to form by the attorney general.