the NDH's concentration camps. There were about 30 in total stretching across the NDH. From April to August 1941, the RAVSIGUR had been responsible for the camps' administration. For much of the war, Bureau III was headed by Luburić. According to Siegfried Kasche, the German ambassador to the NDH, Luburić had envisaged creating a network of concentration camps during his time in exile. In May 1941, Kvaternik had ordered the construction of two detention centers in the villages of Krapje (Jasenovac I) and Bročice (Jasenovac II), the first two sub-camps of what was to become the Jasenovac concentration camp. Krapje and Bročice opened on 23 August. The same day, faced with the Italian military occupation of Zone II, Bureau III ordered the dissolution of all concentration camps situated in the NDH's coastal areas. In the first months of the Jasenovac concentration camp system's operation, Luburić rarely ordered mass executions without the consent of his superiors. Ante Moškov, a leading Ustaše official, remarked: "He was more fond of the Poglavnik than he was even of his own mother and brothers, and loyalty and obedience to him was the meaning of his life." Luburić's loyalty and dedication eventually paid off, and as the war progressed, he became a trusted member of Pavelić's inner circle. In late September 1941, the government of the NDH dispatched Luburić to the Third Reich to study German methods of creating and maintaining concentration camps. Luburić's tour of the camps lasted ten days. Subsequent Ustaše camps were modelled on Oranienburg and Sachsenhausen. The Jasenovac camp system was situated in a heavily Serb-populated area. On Luburić's orders, between September and October 1941, all Serb villages in the vicinity of the two sub-camps were razed, their inhabitants rounded up and deported to Krapje and Bročice. Between 14 and 16 November 1941, Krapje and Bročice were dissolved. Able-bodied prisoners were forced to construct a third sub-camp, Jasenovac III, which came to be known as the Brickyard (). The sick and infirm were either killed or left to die in the abandoned campgrounds. Of the 3,000–4,000 prisoners detained in Krapje and Bročice at the time of their dissolution, only 1,500 lived to see the Brickyard. Jasenovac, IV–V Armed with the information he had gathered in Germany, Luburić was able to organize the Brickyard more efficiently than Krapje and Bročice had been. In January 1942, Bureau III ordered the establishment of Jasenovac IV,