None of the base improvements, which USA TODAY reviewed via federal purchasing systems, appear to signal a significant increase in size or change in mission. The runway upgrades, for instance, include improvements to the landing and taxiway lighting systems, a critical component given the facility is in darkness for long stretches but depends heavily on resupply flights from the U.S. mainland.

But notes in the contracting materials also reference classified work that might be performed by the U.S. military or specialized contractors.