69th Amphibian Tractor Battalion
?The battalion was constituted in the Regular Army 15 July 1940 as 1st Battalion, 69th Armored Regiment and assigned to 1st Armored Division. Activated and organized 31 July at Fort Knox,Kentucky. Inactivated 10 January 1942 at Fort Knox. Relieved from 1st Armored Division and assigned to 6th Armored Division and activated at Fort Knox 15 February 1942. Reorganized 20 September 1943 and redesignated 69th Tank Battalion (reinforced with service and support and operated as 69th Tank Battalion Combat Team [BCT] during operations in Belgium). Relieved from 6th Armored Division and concurrently reorganized and redesignated 69th Amphibian Tractor Battalion 10 July 1945 in Germany - three months after the war in Europe ended. (At this point I've answered your question but you now know little more, if anything, than you did before.)
It appears the battalion was being prepared for redeployment to the Pacific Theater but the war ended altogether twenty-six days later and the battalion was instead sent to Fort Kilmer, New Jersey, where it was inactivated 8 March 1946.
The battalion was reactivated 21 August 1950 and concurrently redesignated 69th Medium Tank Battalion and reassigned to 6th Armored Division. Activated 5 September 1950 at Fort Leonard Wood, Missouri where it trained replacements throughout the Korean War. Inactivated 16 March 1956 at Fort Leonard Wood. Relieved from assignment to 6th Armored Division 1 February 1957 and concurrently consolidated with 69th Armor, a parent regiment under the Combat Arms Regimental System (CARS).
1st Battalion, 69th Armor assigned to 4th Infantry Division during the Vietnam War. Currently inactive.