Marston Mat, more accurately known as Perforated (or Perforated) Steel Plate (PSP), is a standard perforated steel mat material developed in the United States at waterway test stations shortly before World War II, and many are being prepared for the invasion of Japan. It is stored in the Philippines. Mainly used to quickly build temporary runways and landing strips (also misspelled Marsden Matting). The nickname comes from Marston, North Carolina, adjacent to Camp McCall Airport, where the material was first used. Perforated steel plate (pressed, steel plate, named after the manufacturing process) The steel plate consists of a steel strip with lightning protection holes drilled through it. The holes are arranged in rows with U-shaped channels between the holes. Form hooks along one long edge and slits along the other so that you can connect adjacent pads together. The short sides are cut straight without holes or hooks. To achieve longitudinal locking, the pads are staggered. The hooks are usually held in the gap by steel clips that open the gap when adjacent sheets are properly engaged. The hole is curved upward at its edge so that the beveled edge tightens around the hole. On some pads, T-posts can be passed through holes at intervals to secure the components to the floor.
Sometimes these sheets are welded together. A typical late PSP is the M8 landing pad. Each piece weighs approximately 66 lbs (30 kg) and measures 10 feet (3.0 m) long and 15 inches (0.38 m) wide. The hole pattern of the sheet is for easy transport by plane, as it adds about two-thirds of its weight. When building airports in hard-to-reach areas, a lighter-weight aluminum sheet version was created to facilitate logistics. It is called PAP of perforated aluminum sheet. PAPs are not as common as PSPs. Aluminum was a strategically controlled material during WWII, so less was made. It typically only withstands half the loading cycle of steel, and its high scrap value and short lifespan lead to recycling rather than reuse. Gerald G. Greulich of Carnegie Steel Co. also contributed to the design. An early version tested in the summer of 1940 was solid (non-perforated) ribbed steel. The design was refined in the winter of 1940-1941, which saw unique punch holes on the production version. The first practical use of the Marston pad was during the Carolina exercises, a series of U.S. Army exercises held in November 1941. An airstrip of 3,000 ft (910 m) by 150 ft (46 m) of material was constructed near Camp McCall. Marston County, North Carolina. Installation at the airport was completed in 11 days. Henry H. Arnold, then Air Force Commander, toured the completed airfield and called it "the greatest achievement of the year in air combat." 
Immediately after the drill, the runway was removed, and the component mats were transported by rail to Langley Field. During World War II, the Marston Matt was widely used by Army engineers and Seabees ("CBs"; Construction Battalions) to build runways and other usable surfaces on a variety of terrains. The first use of the PSP in a theater was the construction of a 5,000-foot (1,500-meter) runway at "Bluie West One" (BW-1) in Greenland, the coastal community of Naxal-Suaq at U.S. Air Force Base. At the end of the war, vast quantities of supplies were used as war remnants for various civil engineering applications such as road and bridge construction. Because they are made of steel with high manganese content, matte is also very resistant to corrosion. In various countries located in the Pacific theater of operations, notably in the Philippines and Papua New Guinea, mats are still used as fences or road barriers, in some cases extending for miles. Marston Mat is a pressed steel sheet with perforations to reduce weight and promote drainage and can be joined together to create a broad and stable surface on the sand and another terrain.
It was widely used as a ground vehicle on beaches during World War II and was an important part of D-Day. The steel is ready, but not yet finished for the steel plate. After removing (mostly) rust, dirt, etc. with high-pressure water, the antique beauty is brought to full effect. For example, nothing is sandblasted or ground. It had to be thinned down to 1mm and pressed into a flat sheet, a conservative estimate of 100 sheets of material could be made. As with vintage watches, the silkscreen is white on a dark background (but not black in this case). The outer ring has the requisite A-11 hack center seconds hand and 10-minute numerals, while the hour and minute hands are embedded with a modern Super-LumiNova (synthetic patina). The beauty of the dial makes the watch look old and original, and all dials will have unique and original markings. "Marsden pads" are corrugated, segmented metal sheets that are bolted together to build a damaged airfield that can land planes on the runway as quickly as possible after an enemy attack. Modern planes land too fast or too heavy for Marsden pads to be practical, so large, folded fiberglass pads are used instead.
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