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MEDITERRANEAN SEA - APRIL 7:  In this handout provided by the U.S. Navy,The guided-missile destroyer USS Porter fires a Tomahawk land attack missile on April 7, 2017 in the Mediterranean Sea. The USS Porter was one of two destroyers that fired a total of 59 cruise missiles at a Syrian military airfield in retaliation for a chemical attack that killed scores of civilians this week. The attack was the first direct U.S. assault on Syria and the government of President Bashar al-Assad in the six-year war there.  (Photo by Ford Williams/U.S. Navy via Getty Images)
MEDITERRANEAN SEA - APRIL 7:  In this handout provided by the U.S. Navy,The guided-missile destroyer USS Porter fires a Tomahawk land attack missile on April 7, 2017 in the Mediterranean Sea. The USS Porter was one of two destroyers that fired a total of 59 cruise missiles at a Syrian military airfield in retaliation for a chemical attack that killed scores of civilians this week. The attack was the first direct U.S. assault on Syria and the government of President Bashar al-Assad in the six-year war there.  (Photo by Ford Williams/U.S. Navy via Getty Images)

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    US missile strikes past and present

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US missile strikes past and present

CNN's Gary Tuchman explains the history of US missile strikes as a means to punish an adversary or to send a warning.

US missile strikes past and present

CNN's Gary Tuchman explains the history of US missile strikes as a means to punish an adversary or to send a warning.