Top US military generals visited elite troops stationed in Manda Bay, Lamu after the daring Al-Shabaab attack.
Thursday's visit came only four days after Department of Defense authorised deployment of more troops to Kenya following the Sunday's attack.
Already, troops from elite East Africa Response Force (EARF) have arrived at the coastal strip to beef up security.
General Stephen Townsend, the Commander of US Africa Command, said the generals visited for morale boosting.
"I immediately sent members of my command team to hear directly from our troops and commanders on the ground about the details of the attack by al-Shabaab," said U.S. Army Gen. Stephen Townsend, commander, U.S. Africa Command.
"I want ground truth to assess the situation and hear from the troops to ensure they have what they need to accomplish their mission. As the circumstances surrounding this attack are investigated, our deepest condolences remain with the families of our fallen teammates. Their sacrifices will never be forgotten."
Defense Secretary Mark Esper on Tuesday condemned the attack that left three Americans dead. Five terrorists were killed during the gunfight.
Among those who visited include U.S. Army Maj. Gen. Michael Turello, the senior U.S. Africa Command officer on the continent and commander, Combined Joint Task Force-Horn of Africa (CJTF-HOA), met with U.S. Air Force Brig. Gen. Leonard Kosinski, U.S. Africa Command director of logistics, in Manda Bay to gain an initial assessment of the situation.
Kosinski was accompanied by U.S. Navy Command Master Chief Ryan Burton, acting command senior enlisted leader, along with an investigating officer. Townsend has directed an investigation into the facts and circumstances surrounding the attack by al-Shabaab of the airfield at Manda Bay.
"Al-Shabaab is ruthless and must be dealt with before the network expands its reach to other places, to include their stated desire to strike U.S. citizens on the U.S. homeland," said Townsend.