The US Army said it had committed about 3,200 forces, who would provide medical and logistic support, as well as site security, in Ebola-hit regions.Troops going to the regions will be monitored by medical experts for Ebola-prevention and health protection before, during and after deployment, Kirby said. The World Health Organisation said Friday that the world's worst Ebola outbreak on record has now killed 3,439 people.