The US says it will deploy two more combat ships to Singapore in the next two years as part of America's commitment to deepening its military engagement in the Asia-Pacific region.
Defense Secretary Chuck Hagel said he also discussed on Thursday (local time) with his Singaporean counterpart Ng Eng Hen how to expand military co-operation in cyber and maritime security.
The US has just completed the first, seven-month deployment of a littoral combat ship to the Southeast Asian city state. Up to four deployments are planned by the end of 2016.
The next ship will arrive in late 2014.
The two officials also discussed China's new air defence identification zone, which lies further north.
Hagel repeated the US call for China not to implement it or take similar actions elsewhere in the region.