U.S. troops deploy to aid with Ebola

A health worker takes the temperature of U.S. Marines arriving to take part in Operation United Assistance near Monrovia, Liberia, Oct. 9, 2014.

Some 90 Marines landed on KC-130 transport planes and MV-22 Ospreys to support the American effort to contain the Ebola epidemic.

The Ospreys will transport U.S. troops and supplies as they build 17 Ebola treatment centers around Liberia.

U.S. President Barack Obama has committed up to 4,000 troops in West Africa to combat the disease.

Fort Campbell, Kentucky

U.S. Army soldiers from the 101st Airborne Division (Air Assault), who are earmarked for the fight against Ebola, train before their deployment to West Africa, at Fort Campbell, Kentucky, Oct. 9, 2014.

The U.S. military is ramping up its response to the Ebola outbreak in West Africa, where it has already killed more than 3,400 people in Liberia, Sierra Leone and Guinea.

Monrovia

U.S. Marines arrive as part of Operation United Assistance in Monrovia, Liberia, Oct. 9, 2014.

Fort Campbell, Kentucky

James Knight and Ondraya Frick from the U.S. Army Medical Research Institute of Infectious Diseases (USAMRIID) train U.S. Army soldiers from the 101st Airborne Division (Air Assault), who are earmarked for the fight against Ebola, before their deployment to West Africa, at Fort Campbell, Kentucky, Oct. 9, 2014.

Fort Campbell, Kentucky

Ondraya Frick from the USAMRIID demonstrates how to properly apply tape to gloves for U.S. Army soldiers from the 101st Airborne Division (Air Assault), who are earmarked for the fight against Ebola, before their deployment to West Africa, at Fort Campbell, Kentucky, Oct. 9, 2014.

Monrovia

U.S. Ambassador to Liberia Deborah Malac (L) speaks to a soldier at a newly-built clinic to treat Liberian health workers who have contracted the Ebola virus, at Roberts international airport, outside Monrovia, Oct. 9, 2014.

Fort Campbell, Kentucky

Protective gear for U.S. Army soldiers from the 101st Airborne Division, who are earmarked for the fight against Ebola, is seen during training before their deployment to West Africa, at Fort Campbell, Kentucky, Oct. 9, 2014.

Fort Campbell, Kentucky

James Knight of the USAMRIID trains U.S. Army soldiers from the 101st Airborne Division, who are earmarked for the fight against Ebola, before their deployment to West Africa, at Fort Campbell, Kentucky, Oct. 9, 2014.

Monrovia

U.S. Air Force airmen disinfect their hands after a day of setting up a 25-bed hospital to aid Liberian health workers infected with Ebola near Monrovia, Liberia, Oct. 8, 2014.

The airmen are constructing a modular hospital, known by the military as an expeditionary medical support system (EMEDS), near the international airport ouside of Monrovia.

The airmen will train U.S. public health service members in using the hospital's medical equipment, but will not be involved in treatment of Ebola patients.

Monrovia

Airmen from the 633rd Medical Group of the U.S. Air Force set up tents for a 25-bed hospital to aid Liberian health workers infected with Ebola, near Monrovia, Liberia, Oct. 8, 2014.

Fort Campbell, Kentucky

Protective suits are displayed as U.S. Army soldiers from the 101st Airborne Division, who are earmarked for the fight against Ebola, take part in training before their deployment to West Africa, at Fort Campbell, Kentucky, Oct. 9, 2014.

Fort Campbell, Kentucky

A soldier goes through the decontamination process with U.S. Army soldiers from the 101st Airborne Division, who are earmarked for the fight against Ebola, take part in training before their deployment to West Africa, at Fort Campbell, Kentucky, Oct. 9, 2014.

Monrovia

U.S. soldiers have their temperatures taken upon arrival at Roberts International airport, outside Monrovia, Oct. 9, 2014.

Fort Campbell, Kentucky

A U.S. Army soldier from the 101st Airborne Division goes through decontamination process training before deployment to West Africa, at Fort Campbell, Kentucky, Oct. 9, 2014.

Fort Campbell, Kentucky

U.S. Army soldiers from the 101st Airborne Division put on protective suits during training before their deployment to West Africa, at Fort Campbell, Kentucky, Oct. 9, 2014.

Fort Campbell, Kentucky

A U.S. Army soldier from the 101st Airborne Division goes through decontamination process training before deployment to West Africa, at Fort Campbell, Kentucky, Oct. 9, 2014.

Fort Campbell, Kentucky

U.S. Army soldiers from the 101st Airborne Division train before their deployment to West Africa, at Fort Campbell, Kentucky, Oct. 9, 2014.

Monrovia

Airmen from the 633rd Medical Group of the U.S. Air Force unload equipment for a 25-bed hospital to aid Liberian health workers infected with Ebola, near Monrovia, Liberia, Oct. 8, 2014.

Monrovia

U.S. Marines arrive to take part in Operation United Assistance near Monrovia, Liberia, Oct. 9, 2014.