<P> In 2005, Malabar featured the participation of the aircraft carriers USS Nimitz (CVN - 68) and INS Viraat . During a month of operations, US and Indian forces collaborated on a wide variety of tasks ranging from a joint diving salvage operation to a 24 - hour' war at sea' simulation that saw the two forces engage in mock combat . </P> <P> In 2006, the USS Boxer (LHD 4) Expeditionary Strike Group (BOXESG) comprising 13 ships including amphibious ships, cruisers, destroyers, and the US submarine USS Providence (SSN - 719) as well as Marines from the 15th Marine Expeditionary Unit (MEU) participated in the exercise . It was the first time a United States Expeditionary Strike Group (ESG) led the exercise . The addition of the U.S. Coast Guard Cutter Midgett (WHEC 726) and an Indian Coast Guard Patrol Ship allowed for the exchange of Coast Guard practices between nations in maritime law enforcement, anti-piracy operations, pollution control, search and rescue, and VBSS support . During the second phase, BOXESG pulled into several Indian ports, including Mumbai and Goa . The stop offered BOXESG a chance to experience Indian culture, re-supply, and support a Habitat for Humanity project . The visit gave leadership a chance to discuss future Malabar exercises and interoperability between the three nation's armed forces . </P> <P> Malabar 2007 was the ninth Malabar exercise and was the first one to be held outside the Indian Ocean, off the Japanese island of Okinawa . </P> <P> Besides interception and dissimilar air combat exercises, it featured surface and anti-submarine warfare, maritime interdiction and visit, board, search, and seizure operations to counter piracy and other non-state acts at sea . On 4 September 2007, the naval exercise included 25 vessels from India, the United States, Japan, Australia and Singapore in the Bay of Bengal . This was the first time a joint exercise of this scale involving 25 vessels was conducted . The exercise was previously a bilateral India - US engagement that was expanded for the first time . </P>

Which of these naval exercises is conduted jointly by india and singapore