Such simplified and dangerous planes were the products of the last phase of the Third Reich, when the lack of materials and the dire need for a strong defense against the Allied bombing raids required such craft to be built quickly in underground factories. During this period the Nazi authorities also considered the use of "selbstopfer" (suicide) planes such as the "Reichenberg" (a crewed version of the V-1 flying bomb), and in one case of actual use, a "special detachment" unit dedicated to desperate aerial ramming tactics, known as "Sonderkommando Elbe".