“More American forces are reaching West Asia, with a Navy ship carrying about 2,500 Marines having now arrived in the region, US Central Command announced Saturday.”

“The USS Tripoli, an amphibious assault ship, as well as the elements from the 31st Marine Expeditionary Unit that are aboard, are based in Japan. They were conducting exercises in the area around Taiwan when the order came to deploy to the Middle East almost two weeks ago.”

“Central Command said that in addition to the Marines, the Tripoli also brings transport and strike fighter aircraft, as well as amphibious assault assets to the region. The USS Boxer and two other ships, along with another Marine Expeditionary Unit, have also been ordered to the region from San Diego.”

“Secretary of State Marco Rubio said Friday the United States can meet its objectives 'without any ground troops'.”

“But he also said Mr. Trump 'has to be prepared for multiple contingencies' and that American forces are available 'to give the president maximum optionality and maximum, opportunity to adjust to contingencies should they emerge.'”

“The Saudi base had come under come attack twice earlier in week, including an incident that injured 14 U.S. troops, according to the people, who were not authorised to discuss the matter publicly and spoke on the condition of anonymity.”

“The base, which is about 96 kilometers (60 miles) from the Saudi capital of Riyadh, is run by the Royal Saudi Air Force, but also used by US troops.”