Nine Army and Marine Corps choppers were expected to arrive in Haiti today, and will conduct surveys to figure out which areas are hardest hit before delivering aid, the military's head of its Southern Command, Admiral Kurt Tidd, told reporters.
"We have reports indicating that roads and communications infrastructure along the southern coastline are impassable," Kurt said yesterday.
Between 150-200 US troops will be on the ground in Haiti, and operations in the country will be directed from a center at Port-au-Prince airport.
A Navy official said the ships were yet to receive formal requests for help from Haiti.
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"They are underway, heading south, to be prepared to provide disaster response. They haven't yet received any orders," the official said.
Hurricane Matthew -- the Caribbean's worst storm in nearly a decade -- pounded Haiti this week, and aid organizations are bracing for "catastrophic damage" in the impoverished nation's hardest hit regions.
The United States Agency for International Development (USAID) is coordinating the US response and has dispatched an elite team to the poorest nation in the Americas.