Factual error: All through the movie Pfc. Garlick is shown trying to turn the key on a jeep that is already running. The reason that this is a mistake is that tactical vehicles (jeeps) do not have ignition keys they have a starter button. So if you want to keep someone from stealing your jeep you padlock the steering wheel.
Factual error: The jeep they are driving into the jungle that gets blown off the road is actually a civilian jeep, as evidenced by the headlight trim rings being mounted on the outside of the grill. Military jeeps have the lights behind the grill to facilitate "blackout" lighting.