A small number were used by the US Marine Corps' 1st Tank and 1st Scout Companies prior to the war. Some were employed on Western Samoa. None of those tanks saw action. After the attack on Pearl Harbor, the Ordnance Committee determined that a few CTLS-4TAC and 4TAYs would be dispersed to the U.S. Army and employed in the Aleutian Islands campaign. Under Ordnance Committee Minutes (OCM) 18526, these examples were subsequently designated as the Light Tank T16 and Light Tank T14 respectively.