The American military effort against history's deadliest Ebola outbreak is taking shape in West Africa, but concerns are mounting that the pace isn't fast enough to check a virus that is spreading at a terrifying clip. (Further reading: Number being screened for Ebola in Texas grows to 80).

On Saturday, a handful of troops from the Navy's 133rd Mobile Construction Battalion led a bulldozer through thigh-high grass outside Liberia's main airport, bottles of hand sanitizer dangling from their belt loops.

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