Sec. 237. Availability of funds for Iron Dome short-range rocket defense program.
Of the amounts authorized to be appropriated for fiscal year 2013 by section 201 for research, development, test, and evaluation, Defense-wide, and available for the Missile Defense Agency, $210,000,000 may be provided to the Government of Israel for the Iron Dome short-range rocket defense program as specified in the funding table in section 4201.
National Defense Authorization Act for Fiscal Year 2011
Section 1507—Iron Dome Short-Range Rocket Defense Program
This section would allow the Secretary of Defense to provide up to $205.0 million from the funds authorized in section 1506 of this title for Defense-Wide Activities Procurement to the Government of the State of Israel for procurement of the Iron Dome defense system to counter short-range rocket threats.
It basically provides for building a number of extra batteries, which the US is interested in having access to. No relevance as to development. Just a US toe in the shop door.