There is no longer a “military” mode or less accurate civilian mode. There is one mode. Can’t reduce accuracy or encrypt because the world uses GPS for everything and many uses are necessary for safety. Imagine going to an encryption/less accurate mode and those jets on short final on a Cat III approach. . .splat.
Therefore, there is no encryption mode for military users.
No encryption and anti-jamming on the units I used, from hand-carry to the units on my jet.
Mil GPS receivers can receive the P(Y) signal from L2 GPS satellites, which is (or can be) encrypted, and transmits at about 10x the data rate of the civilian bands, so there is encryption built into military units for that function. And “Selective Availability” is still possible, at least for the moment, though it’s turned off and very likely won’t be turned back on. In any case, the military GPS units like the DAGR and various vehicle-mounted systems have all kinds of nifty bells and whistles that the civilian units aren’t allowed to have (at least not and remain ITAR-compliant).