Seriously, what is their strategy, beyond creating cool visuals? Are they worried they won't be able to line up a shot? Because Kong is 104 feet tall and their guns have an effective firing range of up to 1,200 yards when trying to hit a human. They don't have to get within swatting distance to do some damage. Any King Kong movie should realistically end with Kong dying in a hail of gunfire from offscreen vehicles. And it's even worse in movies with modern technology. In Pacific Rim and Cloverfield, the Air Force attacks land-bound aliens with modern fighter jets by flying between the monsters' goddamn legs.
That's about a step away from the Air Force strapping an F-14 onto the back of a pickup truck and driving at them. In modern dogfights, the weaponry has such long range that planes typically never even see each other. Yet when a monster the size of the Golden Gate Bridge appears, the Air Force's highest priority is to get an aerial view of the thing's taint.