The legal instrument used by the USG to transfer itemized defense articles, defense services, and design and construction services to foreign partners.

1. When used under the authorities provided in the Arms Export Control Act for Foreign Military Sales, the LOA is a binding agreement signed by the USG and the foreign partner to transfer such articles and services.
2. When used under Building Partnership Capacity (BPC) authorities, the BPC LOA is not signed by the Benefitting Partner.