 Hood , however , was sufficiently advanced in construction that she was completed in 1920 and immediately became flagship of the Battlecruiser Squadron of the Atlantic Fleet . She served as the flagship of the Special Service Squadron during its round @-@ the @-@ world cruise in 1923 @-@ 24 . Hood was transferred to the Mediterranean Fleet in 1936 and spent much of the next few years on Non @-@ Intervention Patrols during the Spanish Civil War , returning to the United Kingdom before the beginning of World War II and the Battlecruiser Squadron of the Home Fleet . 
