Camp Lejeune Base PMO (Base Police) used full time DES encryption back in the 90's. I moved away in January 1997 and it was in encrypted 100% of the time. They were using 403-433 MHz Systems Sabers with OTAR modules for DES.
I moved back in 2007 and the system was/is NOT encrypted. They were using Astro Sabers, XTS3000s, XTS2500s and XTS5000s in analog mode. None of their talkgroups are digital and none are encrypted. It's like they took a giant leap backwards. The system will pass P25 and still passes DES encrypted audio on analog radios (Systems Sabers). Not sure why they abandoned encryption.
I was happy, 'cause I remember only being able to hear the hash of the DES "squelch" sound. When I moved away, there was not a scanner on the market that trunk-tracked OBT (VHF/UHF) systems.
They are suppose to be upgrading the system to the newer 380 MHz band (was suppose to happen in 2008), but nothing has changed. It has been nice to listen to them, but I know it'll be short lived as they've done it before and they'll do it again.