Singapore Business Federation to promote trade, economic development and partnerships. The CECA eliminated tariff barriers, double taxation, duplicate processes and regulations and provided unhindered access and collaboration between the financial institutions of Singapore and India. The CECA also enhanced bilateral collaboration related to education, science and technology, intellectual property, aviation and relaxed visa regulations for Indian professionals in information technology, medicine, engineering and financial fields to emigrate and work in Singapore. Singapore has invested in projects to upgrade India's ports, airports and developing information technology parks and a Special Economic Zone (SEZ). India has become Singapore's 4th biggest tourist destination and more than 650,000 Indians visited Singapore in 2006. Both nations have worked to collaborate on aviation, aerospace engineering, space programmes, information technology, biotechnology and energy. Singapore and India successfully concluded the second review of the India-Singapore Comprehensive Economic Cooperation Agreement (CECA) on 1 June 2018 in the presence of India Prime Minister Narendra Modi and Singapore Prime Minister Lee Hsien Loong. In September 2018, India and Singapore formally launched the third review of CECA which focuses on trade facilitation, e-commerce and customs. Military cooperation In 1994, India and Singapore began their annual naval combat exercise, now called "SIMBEX" Several warships from India and Singapore took part in this interoperable combat exercise. In 2003, India and Singapore signed a Defence Cooperation Agreement, allowing Singapore army and air force to conduct training on Indian soil. On 24 November 2015, India and Singapore signed the agreement for the "strategic relationship" across the board including defence and military, security and intelligence cooperation, political exchanges, enhancing trade and investment, improving financial linkages, improving air connectivity and cooperation in multilateral forums. On 29 November 2017, the two countries signed a naval cooperation agreement aimed at boosting maritime security, joint exercises and mutual logistics support. The agreement also permits ships of either navy to refuel, restock and, rearm at each other military bases. After signing the agreement, Singapore's Defence Minister Dr. Ng Eng Hen stated, "not only would we be more comfortable, we would encourage the Indian Navy to visit Changi Naval base more often". The Republic of Singapore Air Force (RSAF) and the Indian Air Force (IAF) regularly conduct joint military training exercises. India and Singapore also signed the revised Defence Cooperation Agreement to strengthen the existing defence relationship between Indian military and Singapore Armed Forces on 29 November 2017. In 2018, "India-Singapore Bilateral Agreement