posted on Dec, 21 2017 @ 09:27 AM
a reply to: ridgerunner
Almost certainly not USAF. No mission requirement to build them, too visible to hide them, esp. financially, etc.
A program like this would be classified as strategic/defense-wide and spearheaded by a defense agency not service branch. I'd pick NRO.
Of course a civilian clandestine agency is also possible. Try Directorate of Science and Technology.
As to what they are for - probably pretty more than HALE recon assets.