CREATE TABLE table_73074 ("Date" TEXT, "B-52 Model" TEXT, "Serial #" TEXT, "Unit" TEXT, "Bomb Capacity" TEXT, "Mission/Target" TEXT, "Cause of Loss" TEXT)

When 441st bs, 7th bw is the unit what is the b-52 model?
SELECT "B-52 Model" FROM table_73074 WHERE "Unit" = '441st BS, 7th BW'
SELECT "B-52 Model" FROM "table_73074" WHERE "Unit" = '441st BS, 7th BW'