CREATE TABLE table_17026 ("Ships name" TEXT, "Date entered service" TEXT, "Date withdrawn" TEXT, "Tonnage" FLOAT, "Type of Ship" TEXT)

what is the maximum tonnage where date entered service is 25 march 1986
SELECT MAX("Tonnage") FROM table_17026 WHERE "Date entered service" = '25 March 1986'
SELECT MAX("Tonnage") FROM "table_17026" WHERE "Date entered service" = '25 March 1986'