A combat support hospital (CSH, pronounced "cash") is a type of modern United States Army field hospital. The CSH is transportable by aircraft and trucks and is normally delivered to the Corps Support Area in standard military-owned demountable containers (MILVAN) cargo containers. Once transported, it is assembled by the staff into a tent hospital to treat patients. Depending upon the operational environment (e.g., battlefield), a CSH might also treat civilians and wounded enemy soldiers. The CSH is the successor to the mobile army surgical hospital. From November 2017, the United States Army and United States Army Reserve began reorganizing combat support hospitals into smaller, modular units called "field hospitals". Facility The size of a combat support hospital is not limited, since tents can be chained together; it will typically deploy with between 44 and 248 hospital beds, with 44 beds being most common. For patient care the CSH is climate-controlled, and has pharmacy, laboratory, X-Ray (often including a CT Scanner) and dental capabilities (ATP 4-02.5 Casualty Care, May 2013). It provides its own power from generators. The great operational advantage of the deployable medical systems (DEPMEDS) facility is the use of single or double expanding ISO containers or units to create hard-sided, air conditioned, sterile operating rooms and intensive care facilities, which can produce surgical outcomes similar to that seen in fixed facility hospitals, and do so in an austere environment. Function Because they are large and relatively difficult to move, combat support hospitals are not the front line of battlefield medicine. Battalion aid stations, the medical companies of brigade support battalions and forward surgical teams are usually the first point of contact medical care for wounded soldiers. The CSH receives most patients via helicopter air ambulance, and stabilizes these patients for further treatment at fixed facility hospitals. Ideally, the CSH is located as the bridge between incoming helicopter ambulances and outgoing air force aircraft. The CSH is capable of providing definitive care for many cases. Current medical doctrine does not encourage wounded soldiers, if they are not expected to quickly return to operational status, to stay in the combat zone. This is a pragmatic decision as the resources are usually available to bring them home quickly. Military aircraft constantly fly into a theater of operations loaded with equipment and supplies, but often lack a back cargo. Given that adequate "airlift" is usually present, it is easy to evacuate wounded