Although the U.S. focus remains on exerting diplomatic and economic pressure on Syria, the Pentagon and the U.S. Central Command have begun a preliminary internal review of U.S. military capabilities, CNN has learned.

The options are being prepared in the event President Barack Obama were to call for them. Two senior administration officials who spoke about the review to CNN emphasized that U.S. policy for now remains the use of non-military options.

The focus on diplomatic options was underscored by the U.S. ambassador to the United Nations in an interview with CNN on Tuesday.

“Before we start talking about military options, we very much want to ensure that we have exhausted all the political, economic and diplomatic means at our disposal,” Ambassador Susan Rice said on CNN’s “Situation Room with Wolf Blitzer.”

The president has also said that the U.S. is working on non-military options first.

“I think it is very important for us to try to resolve this without recourse to outside military intervention, and I think that’s possible,” Obama said in an interview with NBC News that aired during the Super Bowl on Sunday.

But the military is beginning to look at what can be done. One of the senior U.S. officials called the effort a “scoping exercise” to see what capabilities are available given other U.S. military commitments in the region.

Both officials pointed out that this type of planning exercise is typical for the Pentagon, which would not want to be in the position of not having options for the president, if and when they are asked for.

It would be Gen. James Mattis, head of U.S. Central Command, who would provide details on what U.S. military assets are available, what missions they could perform if asked, and what risks U.S. forces might face.

“The Pentagon is closely monitoring developments in Syria. It wouldn’t be doing its job if it didn’t put some ideas on the table,” one of the senior U.S. officials told CNN. “But absolutely no decisions have been made on military support for Syria.”

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