Naval Outlying Field San Nicolas Island or NOLF San Nicolas Island (ICAO: KNSI, FAA LID: NSI) is a military airport located on San Nicolas Island, in Ventura County, California. The airport is administered by Naval Base Ventura County and is one of several Naval Outlying Landing Fields operated by the US Navy.
Naval Base Ventura County is located in Ventura County
The statement does not directly say that it is located in Ventura County. It is likely that the base is located there, but it's impossible to know this given the context of the statement.
( z1 be-located-at :ARG1 ( z2 facility :name ( z3 name :op "Naval" :op "Base" :op "Ventura" :op "County" ) ) :ARG2 ( z4 county :name ( z5 name :op "Ventura" ) ) )