Camp Lemonnier, Djibouti is the headquarters for Combined Joint Task Force-Horn of Africa.
The Army's 1st Security Force Assistance Brigade will train forces in an effort to contend with Russia and China in Africa.
Troop drawdowns in Africa and Latin America would go against vital U.S. national security interests, commanders said.
Both the U.S. and China have bases in the small East African country.
The militant group al-Shabaab killed a soldier and two defense contractors in the attack.
Defense Secretary Mark Esper said he is sticking to a plan that could draw down U.S. forces in Africa.
The Pentagon should block out the noise and proceed with its plans to cut the bloat from AFRICOM.
The U.S. wants to reduce its presence in Africa as France seeks to bolster the fight against jihadists in the region.
Dustin Harrison was one of three people killed when their base was overrun by insurgents.
Between 50 and 100 U.S. troops with the East Africa Response Force (EARF) were deployed to Manda Bay.