Description: Ships designed to clear mines from vital waterways.
Background: In the early 1980s, the U.S. Navy began development of a new mine countermeasures (MCM) force, which included two new classes of ships and minesweeping helicopters. The vital importance of a state-of-the-art mine countermeasures force was strongly underscored in the Persian Gulf during the eight years of the Iran-Iraq war, and in Operations Desert Shield and Desert Storm in 1990 and 1991.
Osprey (MHC 51) class ships are mine hunter-killers capable of finding, classifying and destroying moored and bottom mines. The MHC 51 has a 15-day endurance and depends on a support ship or shore based facilities for resupply.
Avenger class ships are also designed as mine hunter-killers.
These ships use sonar and video systems, cable cutters and a mine detonating device that can be released and detonated by remote control. They are also capable of conventional sweeping measures. The ships' hulls are made of glass-reinforced plastic (GRP) fiberglass. They are the first large mine countermeasures ships built in the United States in nearly 27 years.