48 CFR §604.7103

1. (a)L/BA shall review solicitations, contract awards, and delivery orders against GSA Federal Supply Schedule contracts exceeding $1 million that are generated by domestic contracting activities, including RPSOs. L/BA shall also review domestic contract modifications exceeding $1 million if the scope or ceiling of the contract may be in question. This review is not required for modifications exercising priced options, incremental funding modifications, and similar actions that do not involve questions regarding the scope or ceiling of the contract.
2. (b)L/BA shall also review and approve any nonpersonal services contract, purchase order or blanket purchase agreement to be awarded to an individual who is a U.S. citizen.