After the war it was inactivated, but later the division number and shoulder sleeve insignia were authorized for use by the 63rd Army Reserve Command (ARCOM).

Although the 63rd Regional Readiness Command located in Los Alamitos, CA, was not authorized to carry the lineage of the 63rd Infantry Division, the creation of the new 63rd Regional Support Command in Moffett Field, CA, authorizes it to inherit the lineage and the bi-color red and blue background 63rd Infantry Division flag as an exception to policy.

On three occasions during the next seventeen months the division turned recruits into combat teams that were sent overseas as replacement troops.

Hard fighting still lay ahead, but the Siegfried Line was Germany's last attempt to defend its prewar boundaries along the western front.

[10] The 253rd Infantry Regiment, received the majority of the German resistance during this time at the Battle of Buchhof and Stein am Kocher.

A final command post was established at Bad Mergentheim on 30 April, 1945,[10] after which the division was assigned security duty from the Rhine to Darmstadt and Würzburg on a line to Stuttgart and Speyer.

[12] On 15 April 1945, American soldiers from the 63rd Infantry Division perpetrated the Jungholzhausen massacre, when they killed between 13 and 30 Waffen-SS and Wehrmacht prisoners of war in Braunsbach.

The 63rd RRC supported both foreign and domestic active Army missions, including participation in NATO operations in Bosnia and Kosovo.

As a key component of the Army Reserve's transition to an operational force, the newly formed 63rd RSC has foregone command and control of units in favor of a greatly expanded area of responsibility.