On the formation of the Wehrmacht in 1935 following the takeover of power by the Nazi Party, Moll volunteered to serve as a first lieutenant (Oberleutnant) in the Army.

In 1940, Moll graduated from a higher military academy and promoted to captain (Hauptmann), and in 1941 he was appointed the second staff officer (supply) of the 20th Panzer Division.

In 1944 Moll was promoted to lieutenant colonel (Oberstleutnant) and took the post of first staff officer for the 29th Panzer Grenadier Division, also in Italy.

He was in that post when his unit surrendered with the rest of Army Group C in May 1945, and he was held as a prisoner of war by the American military until 1946.

On 11 July 1963 Moll was promoted to major general and took over from Johann Adolf Graf von Kielmansegg as commander of the 10th Panzer Division in Sigmaringen.