In DMZ you normally start on foot. With the Polaris Dagor, LTV, helicopter or cargo plane you reach your target faster and safer, but the infils are tied to story mission progress.
We complete the required story progress and unlock the infils for you. Each vehicle costs some DMZ cash per use in game, and helicopter and plane need a parachute.
Usually 1 to 3 days, depending on your story progress. Express is faster.