user: Question: What is the launch date for the Ushio DD-54?
Columns: ['Kanji', 'Name', 'Builder', 'Laid down', 'Launched', 'Completed']
Types: ['text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['綾波', 'Ayanami DD-45', 'Fujinagata Shipyards, Japan', '20 January 1928', '5 October 1929', '30 April 1930']
SQL:

assistant: SELECT "Launched" FROM "Table" WHERE "Name" = 'Ushio DD-54';