[jandrewrogers]

US weapon systems have never relied on GPS for guidance. Some will accept GPS corrections to the primary inertial guidance system but those corrections will be rejected if they deviate more than a few meters from the inertial guidance. US missiles in particular use precision terminal guidance which doesn't involve GPS at all; in these systems GPS would only be used to correct mid-course guidance.

There has been anecdotal evidence for years suggesting that the latest US inertial guidance technology is sufficiently precise and accurate that GPS correction no longer adds value.

[karp773]

I do not think that is correct. For example, Excalibur [1] relies on GPS and proved to be quite inefficient in Ukraine. Russia figured out how to jam them in a few months.

[1] https://en.wikipedia.org/wiki/M982_Excalibur