There's also the Navy's most advanced submarine -- the Virginia-class. Several of these subs are based at Pearl Harbor.

"Yes, it's about having numbers in that 60-40 split, but also about having the right capability," he said.

The policy offers further details to the Obama administration's announcement earlier this year of a new defense strategy that places greater emphasis on a U.S. military presence in the region in response to Asia's growing economic importance and China's rise as a military power.

The Navy now has about 285 ships about evenly divided among the Atlantic and Pacific oceans. The total number of ships will decline in coming years as some vessels are retired and not replaced.

It has 11 aircraft carriers. A majority -- six -- are already assigned to the Pacific.

The policy is an extension of a 2006 Bush Administration-era policy that had the Navy base 60 percent of its submarines in the Pacific.