Which is a non-appropriated program administered by the DoD through which eligible foreign governments including eligible international organizations such as NATO can purchase defense articles serv?

The program you are referring to is the Foreign Military Sales (FMS) program. It is a non-appropriated program administered by the Department of Defense (DoD) that allows eligible foreign governments and international organizations like NATO to purchase defense articles and services. Through FMS, the U.S. government facilitates the sale of military equipment and services to allied nations, thereby enhancing international security cooperation.