; (iii) technical milestones for co-production of parts and components and procurement; (iv) a joint affordability working group to consider cost reduction initiatives; and (v) joint approval processes for third-party sales; and (D) the level of co-production described in subparagraph (C)(i) for the Arrow 3 Upper Tier Interceptor Program is not less than 50 percent. (d) Number In carrying out paragraph (2) of subsection (b) and paragraph (2) of subsection (c), the Under Secretary may submit— (1) one certification covering both the David's Sling Weapon System and the Arrow 3 Upper Tier Interceptor Program