Lockheed Martin Corp., Lockheed Martin Aeronautics Co., Fort Worth, Texas, is being awarded a $75,980,553 modification to a previously awarded firm-fixed-price contract (N00019-12-C-0004) for the procurement of 252 helmet mounted display systems in support of the F-35 Lightning II aircraft for the U.S. Navy, U.S. Air Force, and the governments of Japan and Israel. This modification combines purchases for the U.S. Navy ($33,541,274; 44 percent); the U.S. Air Force ($28,938,439; 38 percent); international partners ($10,103,656; 13 percent); and the governments of Japan ($2,264,917; 3 percent) and Israel ($1,132,267; 2 percent). Work will be performed in Fort Worth, Texas, and is expected to be completed in July 2017. Fiscal 2012 and 2014 aircraft procurement (Navy and Air Force), international partner and foreign military sales funding in the amount of $75,980,553 is being obligated on this award, $30,806,571 of which will expire at the end of the current fiscal year. The Naval Air Systems Command, Patuxent River, Maryland, is the contracting activity.