It was a consideration. This is why M-Code exists - so be spoof resistant. And jamming is just a fact of life, which is why the vast majority of US military GPS guided munitions are actually GPS/INS guided munitions. They are all capable of falling back to inertial navigation, with some degradation in performance.
USG is in this position for a few reasons:
* It is actually technologically difficult to create GPS equivalent INS (or similar system). Everyone is pursuing this, not just USG/DOD. The Chinese are too for sure.
* It is true that the DoD became somewhat over reliant on GPS from a training and doctrine perspective. While they continued to develop and buy systems and munitions with INS backup, you can't operate with near total air/space/cyber dominance for ~2 decades without it somehow effecting your culture
* The war in Ukraine has been a catalyst for all sorts of technological changes, both in the West, but all across the world.
USG is in this position for a few reasons:
* It is actually technologically difficult to create GPS equivalent INS (or similar system). Everyone is pursuing this, not just USG/DOD. The Chinese are too for sure.
* It is true that the DoD became somewhat over reliant on GPS from a training and doctrine perspective. While they continued to develop and buy systems and munitions with INS backup, you can't operate with near total air/space/cyber dominance for ~2 decades without it somehow effecting your culture
* The war in Ukraine has been a catalyst for all sorts of technological changes, both in the West, but all across the world.