As Crown Prince, Olav had received extensive military training and had participated in most major Norwegian military exercises. Because of this he was perhaps one of the most knowledgeable Norwegian military leaders and was respected by other Allied leaders for his knowledge and leadership skills. During a visit to the United States before the war, he and his wife had established a close relationship with President Roosevelt. These factors would prove to be important for the Norwegian fight against the attacking German forces. In 1939, Crown Prince Olav was appointed an admiral of the Royal Norwegian Navy and a general of the Norwegian Army.