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				 Lawmakers and 
				independent watchdogs are anxious to keep tabs on an upgrade 
				program after years of cost overruns and delays on the initial 
				fighter jet program. U.S. officials have said in the past that 
				the F-35 program has made progress on cutting costs and 
				technical issues since a major restructuring in 2010. 
				 
				U.S. Defense Acquisition Chief Frank Kendall told reporters that 
				testing, which was expected to take place in the second half of 
				2017, would now come in 2018. 
				 
				The F-35 program chief, Air Force Lieutenant General Chris 
				Bogdan, said the delay was taking place in order to get the 23 
				airplanes needed for testing to be configured with the jet's 
				final software, known as Block 3F. 
				 
				Lockheed officials did not immediately respond to an emailed 
				request for comment late on Tuesday evening. 
				 
				Lockheed is developing three models of the jet for the U.S. 
				military and nine countries that have already placed orders: 
				Britain, Italy, Turkey, the Netherlands, Norway, Australia, 
				Japan, Israel and South Korea. 
				 
				The Pentagon has forecast that the total cost of the stealth 
				fighter jet program would reach $1.5 trillion by 2070 including 
				development and procurement, as well as operating costs and 
				inflation. 
				 
				In a report published earlier this year, the Pentagon's chief 
				weapons tester said that final phase of testing should be 
				delayed because the current schedule was unrealistic. 
				 
				(Reporting by Idrees Ali) 
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