CREATE TABLE table_73073 ("Date" TEXT, "B-52 Model" TEXT, "Serial #" TEXT, "Unit" TEXT, "Bomb Capacity" TEXT, "Mission/Target" TEXT, "Cause of Loss" TEXT)

When 7th bw attached to 43rd sw is the unit what is the b-52 model?
SELECT "B-52 Model" FROM table_73073 WHERE "Unit" = '7th BW attached to 43rd SW'
SELECT "B-52 Model" FROM "table_73073" WHERE "Unit" = '7th BW attached to 43rd SW'