The Germans used their airpower and artillery to reduce the Soviet force through attrition warfare. Carrier strike groups gain and maintain sea control as well as project naval airpower ashore. In the spring of 1929, she participated in fleet maneuvers that foreshadowed naval airpower. The Germans did not have the airpower or tanks to secure their battlefield gains. South Africa provided much needed airpower and troops. Its role is to "provide the Canadian Forces with relevant, responsive and effective airpower". He was also one of the early proponents of Polish tanks and airpower. This was the first real test of American airpower in the war. In July 1944, the Directorate of Netherlands Airpower was established in London. It was accomplished largely thanks to an overwhelming deluge of German airpower. On 22 February 1944, a massive reorganization of American airpower took place in Europe. The combined airpower had about 33,975 personnel. There was almost no use of offensive airpower. The U.S. began a rapid build-up of airpower. He also submitted a memorandum that criticized German use of airpower as "wretched".