The United States may be sending some of its Logistics Support Vessels (LSVs) to be based in Singapore by late 2016 or early 2017, according to the US military.
The possible deployment of the LSV is in addition to the US' plans to permanently base four of its littoral combat ships in Singapore. One of the ships, the USS Fort Worth, is on a 16-month deployment to Asia.
http://www.channelnewsasia.com/news/singapore/us-logistics-support/2506738.html
The United States has deployed a P-8 Poseidon spy plane to Singapore for the first time.
In addition to the P-8 deployment, the US says it will operate a military plane, either a P-8 Poseidon or a P-3 Orion, from Singapore for the foreseeable future, rotating planes on a quarterly basis.
http://www.bbc.com/news/world-asia-35036220