When Jarod types out the fake orders, he uses the date 2 October, 1999. This is the date this episode originally aired.
In the beginning, when the Colonel says he doesn't know Jarod's rank and whether to call him sir or not, that isn't exactly correct. The Army Criminal Investigation Division (CID) is unique in that it exists outside all other Army chains of command just so there cannot be any influence over CID personnel. CID personnel still do hold rank and must follow all rules regarding respect of rank.
Jarod pretends to be an officer within the Army Criminal Investigation Division (CID).