https://phys.org/news/2018-05-lyft-pendleton-ride-hail.html

With Base Mode, Camp Pendleton is enclosed by a virtual border, or geofence, so that people requesting a ride from the base are only matched with Lyft drivers who have self-identified as cleared to make on-base pickups and drop-offs. Base Mode only appears to riders within the geofence, and is meant to eliminate the can-I-get-a-ride conundrum for would-be passengers who live on, or commute from, Camp Pendleton.

Base Mode goes into effect on Friday, May 18.