user: Question: When 441st BS, 7th BW is the unit what is the b-52 model?
Columns: ['Date', 'B-52 Model', 'Serial #', 'Unit', 'Bomb Capacity', 'Mission/Target', 'Cause of Loss']
Types: ['text', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['6/18/65', 'B-52F', '57-0179', '441st BS, 7th BW', 'Same', 'Same', 'Same']
SQL:

assistant: SELECT "B-52 Model" FROM "Table" WHERE "Unit" = '441st BS, 7th BW';