There is presently no difference in accuracy between military and civilian GPS signals. The civilian / unencrypted stream is no longer intentionally degraded,

There is presently no difference in accuracy between military and civilian GPS signals. The civilian / unencrypted stream is no longer intentionally degraded, as it once was (via "Selective Availability"). But there are still multiple datastreams, and the military one is still encrypted, and the military retains the ability to degrade or disable or degrade the civilian/unencrypted signal if circumstances require it, although it is hard to imagine a circumstance where this would be desirable, given the proliferation of civilian GPS receivers among military personnel, disruption to civil aviation / airlift capability, etc. The military GPS signal from the Block III satellites is called "M-Code": https://en.wikipedia.org/wiki/GPS_signals#Military_(M-code) https://en.wikipedia.org/wiki/GPS_signals#Military_(M-code)