The T1 Cunningham was a US light tank design that never left the prototype stages. Officially carrying the designations of T1E2 and T1E4, it continued through the development stages from 1922 through 1928. This tank was never mass produced, nor was it ever fielded. It is unknown how many were actually produced in the prototype stages, but there is at least one known to have been created, currently at the Aberdeen Proving Ground in Maryland, USA.