 Multi-role frigates like the MEKO 200, and es are designed for navies needing warships deployed in a variety of situations that a general frigate class would not be able to fulfill and not requiring the need for deploying destroyers.At the opposite end of the spectrum, some frigates are specialised for anti-submarine warfare.Increasing submarine speeds towards the end of World War II (see German Type XXI submarine) greatly reduced the margin of speed superiority of frigate over submarine.