Three more soldiers were hospitalized.
Three US service members died and three others injured in the crash, which hit the armored combat vehicle they were.
The incident, which was informed by representatives of the armed forces, occurred in the state of Georgia.
The military did not give details about the nature of the accident, saying only that it occurred during an exercise at Fort Stewart in Georgia. The causes of the accident are being investigated.
“The accident involved six soldiers. Three of them were pronounced dead on the spot, three more were evacuated to Wynn Army hospital, where they are being treated and where the condition of their injuries is being assessed,” the military said in a statement.
The commander of the third infantry division, major General Tony Aguto, called the incident “heartbreaking.”
The soldiers in the Bradley combat vehicle served in the first armored brigade combat team.