Towards the end of World War II, many information about advanced aeronautical technology were captured in Germany by the U.S. Forces. One of them was an analysis of the studies carried out by Dr. Alexander Lippisch on deltawinged aircraft. Based upon the information, the Douglas firm developed the F4D Skyray, the only operational interceptor with delta wings in the U.S. Navy. Although the Skyray never saw any combat, it proved its high capability as an interceptor with numerous world records and scramble actions in Taiwan in response to crises in late 1950’s.