WWI meant, among other things, the development of aviation, which at the beginning of the war was only just finding its way to combat use. Initially, aircraft were used for reconnaissance flights; however, later pilots began dropping hand grenades and other explosives on the enemy. This gave rise to bomber aviation, which brought a completely new element to the war. Bombs were first dropped by hand, only later being fixed in bomb racks under the wings or fuselages of aircraft. The Military History Institute houses a considerable collection of aerial bombs from WWI, mainly of Austro-Hungarian manufacture. The Austro-Hungarian Air Force (KaiserlicheundKöniglicheLuftfahrtruppen) used Lohner and Hansa-Brandenburg aircraft for bombing.