By CNN's Barbara Starr and Jennifer Rizzo

The U.S. military could execute a strike against Syria very quickly, if it's ordered to, according to Pentagon sources.

President Barack Obama is still debating a limited strike after Syrian regime forces allegedly unleashed a brutal chemical attack against civilians and rebel forces earlier this month, killing at least 1,429 people, according to Secretary of State John Kerry.

Before any missiles start flying, the president would issue an "execute" order for operations to begin.
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