Factual error: Upon hearing that the bombs will drop in 3 hours time on Santa Monica, one marine sets the countdown timer on his watch for 3 hours and starts it. The watch is a Casio G-shock GW-9000 Mudman. This particular watch only has a 1-hour countdown timer. (00:24:15)
Factual error: They were hot wiring the city bus - that make of bus does not have a key to start it. There is a power knob you turn to run, and then push a start button.
Factual error: In the scene where the marines are being told what their mission is and where to go, they are told to go to the police station at Venice Blvd. and Amoroso - two streets that don't cross. Later, when they are on the freeway heading toward the FBO, they find out that the offramp is blown. They are told to use the Robertson exit, even though they are on a time crunch. The Robertson exit off the I 10 is about 3 exits from the exit they missed.
Answer: Most likely, coastal cities or cities near a large body of water.