High Quality Content by WIKIPEDIA articles! The Royal Australian Navy, although a significant one in the Asia-Pacific region, is nonetheless classed as a medium sized navy. Its fleet is based around two main types of surface combatant, with limited global deployment and air power capability. However in 2009, a major white paper was produced by the Australian government which set out a programme of defence spending that will see significant improvements to the RAN's fleet and capabilities. The Adelaide class first entered service in the early 1980s, with a total of six units eventually being constructed. The first four were constructed in the United States as part of the US Navy's run of Oliver Hazard Perry class frigates in the late 1970s and early 80s; the remaining two were built in the late 1980s in Australia. However, the later two units were constructed with largely the same technology as the previous four. As a consequence, in the mid 1990s it became necessary to think about upgrading the class as a whole.

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