The US has no standardised process for making compensation payments to the families of thousands of Afghan civilians killed in US-led military operations.
According to US officials the structures built on Spratly islands, which already have military air-strips, could be considered a military escalation.
The US military withdrew a ten-year-old video it posted on Friday to prove that the recent Yemen raid on al Qaida was a success.
US Defence Secretary Ash Carter Carter is in Japan to try to soothe anxieties caused by the victory of Trump, who has called for allies to pay more to sustain US forces or face their possible withdrawal.
Fifteen years after the US invaded Afghanistan to topple the Taliban rulers who had harboured al Qaeda militants who attacked the US, the Taliban have made major gains and are estimated to control more territory than at any time since 2001.
Forty-four Afghan troops visiting the US for military training have gone missing in less than two years, presumably in an effort to live and work illegally in the US.
The decision by the Pentagon is a sign that while it sees some progress by Pakistan in its military operations in North Waziristan, much work remains.
The US State Department has publicly said it still supports Afghanistan in ending the conflict through a peace and reconciliation process with the Taliban.