Plywood was declared an essential war material during WWII, and strict controls were placed on its production and distribution. On an annual basis, wartime mills produced about 1.2 to 1.8 billion square feet of plywood, which was used by several branches of the military during this time. For example, the Navy used plywood PT boats to patrol the Pacific, and the Air Force flew plywood gliders for reconnaissance missions. Additionally, the Army used plywood assault boats to cross the Rhine River.
American designers Ray and Charles Eames experimented with plywood during WWII, developing a technique for creating complex curved shapes. In 1942, they used this technique to design a stackable molded leg splint for sailors in the U.S. Navy. They later went on to develop plywood parts for military aircraft.
In addition to ships and aircraft, other applications for plywood during WWII included barracks, crating for machinery parts, lifeboats, and more.