 The operational status of "Parker" and "Rosales" is not clear, as of November 2012 they were waiting for spares, whilst "Spiro" lost her sonar in a grounding accident in August 2012.The 1974 Naval Constructions National Plan was an initiative by the Argentine Navy to replace old World War II-vintage ships with more advanced warships.The original plan called for six MEKO 360H2 destroyers, four of them to be built in Argentina, but the plan was later modified to include four MEKO destroyers built in Germany and six corvettes built in Argentina, for anti-surface warfare and patrol operations.