Jonas uses the code phrase "Prairie Fire", as the signal to escape and evade. This is an actual code phrase used by US Army Special Forces to signal an emergency egress or extraction. It has been used since Vietnam.
The oceanside railing where Brown talks to the "hippie chick" is at the Port of Los Angeles World Cruise Center (the Vincent Thomas Bridge and the U.S.S. Lane Victory can be seen in the background).
A permissive environment is a situation where they any threats to one's safety from hostile forces is not expected . A non-permissive environment means that danger or the possibility of danger from hostile forces is expected.