As today’s United States Army rolls forward, it will carry along a portable airfield packed in trucks or railroad cars, which will permit the establishment of an ajr base for protection of its advanced position and for harassing enemy troop concentrations. The portable field consists of steel planks, weighing 50 pounds each, which are laid on level ground to form runways and held together with clips to prevent sliding. In this way a landing area 3,000 feet long and 350 feet wide can be laid out, although only 150 feet of the width is of the steel planks and the remainder hard and level sand. If the terrain is rough, “bulldozers” and carryalls make it level.