January 26, 2015 | Associated Press

5 Things to Know: Why Crisis in Yemen Matters to Americans

Hadi's resignation leaves the U.S. without a faithful partner amid its drone-strike and counter-terrorism campaign.

For several years, the CIA and the military's Joint Special Operations Command have run parallel targeted killing programs in Yemen. There were 23 U.S. drone strikes in Yemen last year and 23 the year before, according to Long War Journal, which tracks the strikes based on local media reports. The U.S. military also has trained elite counterterrorism units of Yemen's military that have battled al-Qaida.

Hadi's demise comes four months after President Barack Obama cited Yemen as a terrorism success story in a September speech outlining his strategy against the Islamic State group in Iraq and Syria, which involves targeted U.S. strikes on militants with the cooperation of a friendly ground force. Obama called it an approach “that we have successfully pursued in Yemen and Somalia for years.”

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