An imminent U.S. strike on Syrian government targets in response to the alleged gassing of civilians last week has the potential to draw the United States into the country's civil war, former U.S. officials said, warning that history doesn't bode well for such limited, retaliatory interventions.

The best historical parallels — the 1998 cruise missile strikes on targets in Iraq, Afghanistan and Sudan — are rife with unintended consequences and feature no success stories.

"The one thing we should learn is you can't get a little bit pregnant," said retired marine Gen. Anthony Zinni, who was at the helm of U.S. Central Command when the Pentagon launched cruise missiles at suspected terrorist sites in Afghanistan and weapons facilities in Saddam Hussein's Iraq. "If you do a one-and-done and say you're going to repeat it if unacceptable things happen, you might find these people keep doing unacceptable things. It will suck you in."