The mission has received little attention in the United States, but is considered a cornerstone of the Pentagon's global efforts to combat al Qaeda.
Islamist insurgent group al Shabaab said it was behind the assault on the Elite Hotel in Lido beach, and that its gunmen battled security forces who rushed to the scene.
Somalia has been embroiled in deadly violence since 1991, when clan warlords overthrew leader Siad Barre and then turned on each other.
The US has long had a military role in Africa, but much of it was in the shadows.
"International health organisations said COVID-19 is terribly spreading in countries of Africa continent."
Since 2008, al Shabaab has been fighting to topple Somalia's central government and establish its own rule based on a strict interpretation of Islam's sharia law.