Question: What other country was the queen who launched Dannebrog, also a queen for between 1918 and 1944?
Related documents: [0]  [DOC] Her Danish Majesty's Yacht "Dannebrog" (A540) (Danish: "KDM Dannebrog" ) was launched by Queen Alexandrine at Copenhagen in 1931, and commissioned on 26 May 1932. The yacht now serves as the official and private residence for Queen Margrethe II of Denmark, the Prince Consort, and members of the Royal Family when they are on official visits overseas and on summer cruises in Danish waters. When at sea, the Royal Yacht also participates in surveillance and sea-rescue services. [END] 
[1]  [DOC] Alexandrine of Mecklenburg-Schwerin (24 December 1879 – 28 December 1952) was Queen of Denmark as the spouse of King Christian X. She was also Queen of Iceland from 1 December 1918 to 17 June 1944. [END] 
Answer: 
Iceland
Iceland