The United States Air Force term elephant walk refers to aircraft taxing in proximity. Often associated with Minimum Interval Takeoff, nose to tail formations. This tactic demonstrates teamwork, the capability of the unit, and ability to launch all combat ready aircraft in one mass event. Naturally, the quicker you can put armed aircraft in the air, the more bombs you can efficiently deliver on target in one mass raid.
Note the appearance of the aircraft, as if they were elephants walking to a watering hole, in line with each other.