Large scoot-and-hide shelters east and west of hangars 20-23. They cover the entire ramp area on both sides of the pull-through hangars. Each cover is 500x150' with a 1.75 acre footprint.
There is speculation that hangars 20-23, originally built for the F-117 project, are being re-purposed for the Next Generation Air Dominance (NGAD) project. That project includes a family of networked aircraft, with one manned aircraft and various specialized unmanned companions.
Construction of the covers started between 11/2019 and 04/2020 and was complete in 12/2020.