Spain could provide sailors, not a useful Pacific fleet

What could the Spanish Navy contribute if Spain joined only the Pacific War in 1942?

Its existing ships would add little because of condition and logistics, but Spanish personnel could crew vessels supplied and supported by the United States.

Spain emerged from civil war with a small, worn, and heterogeneous fleet that included older ships and foreign-derived submarines. Moving those vessels into the Pacific would create a supply and maintenance burden out of proportion to their combat value. American fuel, ammunition, spares, and repair systems were not organized around the Spanish inventory. The United States would therefore be more likely to provide compatible ships and use Spanish sailors than deploy the Spanish fleet itself.