DA Form 3955, Change of Address and Directory Card is a form used to assist service members in setting up a new mailing address at a new place of residence. This form is used by Army and Civilian personnel in mail functions and address inquiries.
The Department of the Army (DA) released the latest version of the form - often incorrectly referred to as the DD Form 3955 - in January 2015. An up-to-date DA Form 3955 fillable version is available for digital filing and download below or can be found through the Army Publishing Directorate website.
The sponsor at the soldiers new location is tasked with contacting the post office and completing the DA Form 3955 to obtain a mailing address for the soldier to start forwarding the mail to. If any mail is received before the soldier's arrival, that mail will be held on to until the soldier arrives.
If the soldier is delayed en-route, they must inform the sponsor, who in turn must notify the post office so that the soldier's mail is not returned to the sender.