United States Army Engineer Research and Development Laboratory

The United States Army Engineer Research and Development Laboratory aka ERDL, was a United States Army Corps of Engineers research facility located at Fort Belvoir, Virginia.

The ERDL was formed in 1947 when the Army's Engineer Board was redesignated as the U.S. Engineer Research and Development Laboratory, or ERDL.

Among other things, ERDL was responsible for the creation of the ERDLator water treatment device in World War II, the ERDL woodland camouflage pattern in 1948, and the updated M1950 lensatic compass.

ERDL also established the first U.S. Army research group dedicated to night vision systems in 1954, called the Research and Photometric Section.