Factbox: U.S. military mobilizes for Haiti relief

(Reuters) - The U.S. military has mobilized thousands of soldiers, sailors, Marines, Air Force and Coast Guard personnel to help victims of the January 12 earthquake in Haiti.

The U.S. military is working with the U.N. Stabilization Mission in Haiti (MINUSTAH), the international community and local teams to support humanitarian relief efforts.

Here are the main U.S. military components announced so far:

WHO IS THERE ALREADY?

* The Pentagon said 2,676 U.S. military personnel were on the ground in Haiti as of Thursday, another 10,445 were afloat on 20 ships offshore nearby and 63 helicopters were supporting relief operations.

* About 4,600 additional U.S. military personnel were to be on the ground in Haiti by the weekend for the joint military operation dubbed "Unified Response."

* Among U.S. forces that arrived in Haiti this week were 2,200 Marines in an expeditionary unit on the amphibious ship Bataan. They are equipped with heavy lifting and earth-moving equipment, helicopters and medical support capabilities.

* An aircraft carrier, the USS Carl Vinson, has been producing 100,000 gallons (378,500 liters) of clean water a day, the White House said. Aircraft from the Vinson are flying airlift missions and delivering pallets of relief supplies.

IMMEDIATE MISSION FOCUS

To help meet the need for clean water, U.S. military aircraft, helicopters and vessels are giving the highest priority to the shipment of donated water. Three water treatment units were in Haiti and four additional units arrived on the Bataan.

Overall, there are more than 63 U.S. military and Coast Guard helicopters supporting delivery of aid to victims.

As of Thursday,, U.S. military aircraft and helicopters had airlifted 1.4 million bottles of water, over 700,000 meals and roughly 22,000 pounds (9,980 kg) of medical supplies into the capital Port-au-Prince, U.S. Southern Command said.

U.S. military aircraft are scheduled to support the delivery of about 550,000 additional daily rations.

U.S. and international search teams had rescued 122 earthquake victims, mostly Haitians, the White House said.

A C-17 cargo plane carried out a second large airdrop on Thursday of food and water supplies, this time inland at Mirebalais, northeast of Port-au-Prince.

AMPHIBIOUS GROUP, FLOATING HOSPITAL, PORT

* Accompanying the Bataan is the rest of its amphibious readiness group, Fort McHenry and Carter Hall.

* The hospital ship Comfort, with one of the largest trauma facilities in the United States, arrived on Wednesday with 600 medical personnel aboard. It has 12 operating rooms and 250 hospital beds, four X-ray units, one CAT scan unit, an invasive angiography suite and two oxygen-producing plants. Comfort also has up to 5,000 units of blood on board.

* Among the ships already supporting relief operations are the carrier Vinson, destroyer Higgins, frigate Underwood, cruiser Normandy and the Big Horn, a fleet oiler.

* The opening of the Port-au-Prince port will allow delivery of an initial 150 containers a day. Capacity will grow to 250 containers through mid-February when the arrival of additional equipment will expand it to 800 containers a day.

U.S. AIR FORCE SUPPORT

* Air Force specialists worked closely with Haitian aviation officials and Haiti's government to set up a flight operations center, manage safe air operations and ensure maximum use of the damaged airport.

* The airport is open for round-the-clock operations and is handling 120 to 140 flights a day. More than 840 flights have been handled since it reopened and 1,400 flights are waiting to get into the airport, U.S. Southern Command said.

* Additional airports are being opened at Jacmel southwest of Port-au-Prince, San Isidro in the Dominican Republic capital of Santo Domingo and in Barahona in the southern Dominican Republic.

(Reporting by Jim Wolf; Editing by Jackie Frank and John O'Callaghan)