The United States (U.S.) Department of Defense (DoD) offers a “total package approach� to partner nations that purchase defense articles and services through the Foreign Military Sales (FMS) program. A total package approach includes training, maintenance, operations, and sustainment. While success of the total package approach relies on definition of robust requirements in a partner nation’s Letter of Request (LOR), increased stakeholder participation during FMS case execution often results in realization of additional requirements. Unique requirements for a virtual training system may result from differences in concept of operation of the weapons platform, training objectives, and concept of operation and sustainment of the training system within a customer’s regulatory environment. This paper aligns definition of a partner nation’s unique virtual training system requirements to DoD guidance for building an LOR, and presents implications of implementing these requirements within cost, schedule, and U.S. regulatory constraints of an FMS case. In conclusion, the paper recommends that partner nations prudently define unique, robust requirements for an FMS virtual training system, that DoD exercise due diligence in evaluating partner nation requirements, and that industry partners maintain awareness of unique partner nation requirements for FMS virtual training systems.