> At issue is the U.S. Department of Defense (DoD) desire to be able to jam other radionavigation signals in a theater of operation so as to provide an edge to allied users of military GPS receivers. This "selective denial" capability would be complicated by the presence of an encrypted PRS signal atop the M-code bands, because the U.S. could not jam the PRS without jamming its own signals.

There's some more info here: https://arquivo.pt/wayback/20090628141907/http://findarticle...

>The frequency initially chosen for Galileo would have made it impossible for the US to block the Galileo signals without also interfering with its own GPS signals.

Not an answer to your question but it was more about being able to jam GNSS while still being able to use GPS.

That would actually be the sane solution against stupid warfare..

That frequency not being the same as the one used by the US’s own GNSS system enabling them to block it without blocking their own service.

And vice versa.