Since the 1990s, the ROK Navy has been trying to build an ocean-going fleet to protect its sea lines of communication. In 1989, the Navy mentioned the "Strategic Task Fleet" ("Jeollyak-gidong-hamdae") in the Joint Strategic Objectives Plan. The ROK Naval forces began to participate in RIMPAC exercises from 1990. During Admiral An Pyong-tae's tenure as CNO, President Kim Young-sam supported the Navy by approving a long-term shipbuilding plan for the ocean-going navy. In 1999, the Navy developed its strategic vision for the 2020s as "Navy Vision 2020" that outlined the Navy's future Task Fleet, which includes light aircraft carriers and ballistic missile submarines.