This is a Defense Finance and Accounting Service-Indianapolis country assigned code that divides Foreign Military Sales (FMS) customer country billings into management levels lower than a U.S. Implementing Agency or in-country service. This code often correlates to an FMS customer paying office. It appears in Block 3 of the DD Form 645. Basic alpha codes are derived from the Letter of Offer and Acceptance (LOA). The FMS customer should ensure that the proper bill code is indicated upon acceptance of an LOA.