(For smaller events, is simple first aid post, with only volunteer certified first responders and no medical staff, is set up.) The civil defence military units ("Unité d'instruction et d'intervention de la sécurité civile", UIISC) have airborne field hospitals. The general system is called DICA ("détachement d'intervention de catastrophe aéroporté", i.e. airborne disaster unit), and is specialized in search-and-rescue and in emergency medicine; it can be enhanced by the Fast civil defence medical unit, called ESCRIM ("élément de sécurité civile rapide d'intervention médicale"). The ESCRIM is a surgical unit ("detachement d'appui chirurgical") assisted by a medical assistance unit (DAMHo, "détachement d'appui médical et d'hospitalisation"); the later is specialized in pre- and post-operation care, and allows 48h of hospitalization. The UIISC also has a PMA (i.e. sort, stabilization and evacuation structure) when the hospital infrastructure of the country is sufficient. The Namibian Defence Force operates a mobile field hospital through its Defence Health Services Directorate. It was donated by the German government to Namibia in March 2013. Initially it was a UN level two hospital but has now been upgraded to level one. The field hospital is containerized in tents, it has capacity to treat forty outpatients per day and can admission capacity of twenty patients. It has two intensive care units, laboratories, an X-ray unit and a mobile oxygen concentrator. The dental department can treat 20 and four operations can be carried out daily. It has its own mobile logistics support wing consisting of kitchens, water purifiers, water tanks, toilet and shower containers, generators and sewage and refuse disposal facilities. During the COVID-19 pandemic the hospital was deployed to Hosea Kutako International Airport to aid the country's response. Field hospitals were originally called ambulances. The surgical, evacuation, or field hospitals would remain many miles in the rear, and the divisional clearing stations were never intended to provide emergency life-saving surgery. With the Army's larger mobile hospitals unable to assume their traditional role in support of the front line combat units, the chain of evacuation was interrupted at a critical point. Some sort of interim solution had to be found quickly to provide the necessary surgical services and care to the severely wounded directly behind the front lines.