DRS Sustainment Systems is one of the largest producers of MIL-A-52767 military environmental control units in the world. It has developed and produced more than 18,000 units. The company works in collaboration with the U.S. Army. DRS Sustainment Systems is a business unit of DRS Technologies, which supplies integrated products, services and support to military forces, intelligence agencies and contractors throughout the world. The parent company develops, manufactures and supports a range of systems for military sustainment applications. It offers thermal imaging devices, combat display workstations and electronic sensor systems. DRS Technologies also provides aircraft loaders, military trailers, and mission and deployable flight incident recorders.