DA Form 5513, Key Control Register and Inventory is a form used within and issued by the Department of the Army (DA). This form is required for keeping a record of Key Control Numbers in a particular Army unit. The numbers could be any kind of identifying or serial number assigned to a certain item.
The latest version of the form was released on January 2016 - an up-to-date fillable DA Form 5513 is available for digital filing or download below.
The key and lock custodian's liability is to control and maintain the register form and take inventory of all lock combinations used within a certain facility. Along with the numbers, the form features the name of the person receiving the equipment, the date of return and the name of the lock custodian accepting the returned keys and locks.