user: Question: Where the ship is Dahlgren what is the build as?
Columns: ['Ship', 'Built As', 'Reclassified As', 'Class', 'Commissioned– Decommissioned', 'NVR link']
Types: ['text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['Norfolk', 'DL-1', '—', 'Norfolk', '1953–1970', 'DL1']
SQL:

assistant: SELECT "Built As" FROM "Table" WHERE "Ship" = 'Dahlgren';