and to make the sea and river ports inoperative. They attacked all the seaports including many river ports. Operation Jackpot is one of the best known and most successful operations. They carried out mining in the Pasur River Channel by patrol craft. With other fighters they also carried out attacks against the Pakistan Army. As a result, Bangladesh became an independent state within the shortest possible time. After independence, especially in the 1970s, additional naval infrastructure was required. Two ex-Royal Navy frigates joined the Bangladesh Navy as and in 1976 and 1978 respectively. In 1982 a third ex-Royal Navy frigate joined the BN as . The acquisition of these three frigates is considered the principal foundation of the Bangladesh Navy. 21st century In 2011, the Bangladesh Navy's rescue and medical team, along with the Bangladesh Army, was deployed to Japan after the Tōhoku earthquake and tsunami. The Bangladesh Navy has been an active disaster recovery force abroad. In 2013, the navy deployed carrying humanitarian assistance worth $1 million. The Bangladesh Navy's medical team was also deployed to the Philippines. The Bangladesh Navy joined in the search operation for missing Malaysia Airlines Flight 370 with , BNS Umar Faruq and a Dornier 228NG MPA in March 2014. The aircraft was a Boeing 777-200ER which had gone missing with 12 Malaysian crew members and 227 passengers from 14 nations during the flight from Malaysia to China. Later, BNS Umar Farooq was replaced by BNS Somudra Joy. The search was renewed in May 2014 when an Australian exploration company claimed to have traced aircraft debris in the Bay of Bengal. In 2014, during the Water Crisis in Maldives, the Bangladesh Navy was the first to launch humanitarian aid relief by deploying BNS Somudra Joy with 100 tonnes of bottled water. Forces Goal 2030 In 2009, the Bangladesh government adopted a long-term modernisation plan for its armed forces called Forces Goal 2030. As of 2013, about a third of the military hardware procured under the plan has been for the navy. It procured two refurbished Type 053H2 (Jianghu III) frigates from China in 2014. Two United States Coast Guard High Endurance Cutters joined the BN in 2013 and 2015 which are being used as patrol frigates. Navy also bought an ex-Royal Navy Roebuck-class survey vessel and two ex-Royal Navy offshore patrol vessels (OPVs) which were converted to guided missile corvettes in 2011. Two Type