Multiple recent incidents pose the risk of escalation into open conflict, the U.S. warns.
China said that long-range bombers were among the aircraft that took part in recent aerial drills over the South China Sea.
China accused the U.S. of trying to sow discord between China and the countries with which it has territorial disputes.
The Trump administration is poised to escalate its actions against China by stepping into a sensitive regional issue.
The last time two carriers were in the South China Sea together was September 2014.
In recent months, the U.S. military has stepped up its freedom of navigation operations in the region.
On Friday an American warship approached the Paracel Islands, an island chain claimed by Beijing in the South China Sea.
All ten members of the Association of Southeast Asian Nations will take part in the first Asean-US Maritime Exercise.
The USS Wayne E. Meyer sailed within 12 nautical miles of Fiery Cross and Mischief Reefs in the South China Sea.
The U.S. Navy flew a small group of Philippine generals, officials and journalists to the aircraft carrier Ronald Reagan.
The campaign of President Donald Trump released a letter from 235 retired senior officers backing his re-election.
The news comes four years after the Air Force laid out initial plans for what its future fighter jets might look like.
The recent exercises were one of many the Air Force is conducting to test its Advanced Battle Management System.
A veteran of the Marine Corps and Army National Guard, he went through boot camp more than four decades ago.
Cmdr. Robert Arias is at least the third Navy commander removed from his job in recent weeks.