The investigation finds the troops weren't fully prepared, the mission changed and higher-level commanders weren't properly informed. The soldiers died in an ambush by militants linked to ISIS.
The U.S. military has some 20 missions across the continent. Most are for training African armies not combat. But there are risks as U.S. troops venture into the field.
The military has completed an investigation into the ambush that killed four U.S. soldiers last October. The report has not been released, but the military is briefing families of those killed.
The U.S. relies on a threat-focused approach, when the international community should also support economic and governance development in the region, argues the ex-special forces commander for Africa.
Sgt. Nick Cunningham, a bobsledder, is one of seven U.S. service members competing in Pyeongchang. "They told me, 'Go win medals for this country,'" he says. "And that's my job at this moment."
Sgt. 1st Class A.G. Shaw has been a military mortician throughout America's long wars. Now he says it's time for him to move on. "It's not like the movies. We don't die pretty," he says.
The U.S. military had around 18,000 troops in Syria, Iraq and Afghanistan at the end of last year. The official numbers have gone up in all three countries and now total about 26,000.