CREATE TABLE table_28216 ("Unit" TEXT, "Commander" TEXT, "Complement" TEXT, "Killed" TEXT, "Wounded" TEXT, "Missing" TEXT)

What was the complement for the unit that had 3 off 37 men killed?
SELECT "Complement" FROM table_28216 WHERE "Killed" = '3 off 37 men'
SELECT "Complement" FROM "table_28216" WHERE "Killed" = '3 off 37 men'