1) German city near Cologne 
The Duren is a German Troika Class minesweeper of 465 tons displacement commissioned in 1959. She is powered by two MD 871 UM/ID diesels providing a top speed of 16.5 knots and a range of 850 miles. She is manned by a crew of 44 including five officers and was armed with one Bofors 40 mm/70 anti-aircraft gun.