Ainīt a GA airfield, but a military base. Maybe they have stairs just in case ???
Did nearly the same thing years ago, in a KingAir. Pulled up because I could not see the football stadium you pass on medium finals, was told by EPPO "you are approaching wrong airfield" and "you are not the first to do so".
Was before 911, so I was sort of lucky not to become a potential terrorist.
Was in late afternoon,after a long day, was blinded by sunlight and didnīt care what the GPS told me.
Tough me a lesson. Feel sorry for the crew. Hope they go out of that without major harm...