Many government systems can be replaced by modern upgrades with zero incremental spectrum footprint above the commercial and private systems on which the highly productive civilian sector depends. Look at FirstNet.
Transferring spectrum from old to new users have proven to be much speedier and easier than imagined by PCAST and similar plans of 10 – 15 years ago. Getting governments and government agencies to cooperate is the harder problem.
The only way through our 1,200 year drought is get better at managing and using water than we have been. While RF spectrum isn’t in a similar crisis yet, it’s wise to prepare for an eventuality where demand far outstrips supply. Spectrum, like water, is a finite resource at each point in time even if both are reusable.
The proper role of FAA in this and any similar controversy is to conduct its own measurements and share them with the responsible parties. It should share its findings on altimeter vulnerabilities and leave the modeling in 5G emissions to the experts.
The priority for Congress in the Wednesday hearing to to draw a bright line between network projects in legitimate need of federal support for construction, technical capacity development, and backhaul and those, like Loveland, that are simply vanity projects.