The Ebola outbreak started in rural areas, but by June it had reached Liberia's capital, Monrovia.
By August, the number of people contracting the Ebola virus in the country was doubling every week. The Liberian government and aid workers begged for help.
Enter the U.S. military, who along with other U.S. agencies had a clear plan in mid-September to build more Ebola treatment units, or ETUs. At least one would be built in the major town of each of Liberia's 15 counties. That way, sick patients in those counties wouldn't bring more Ebola to the capital.