The largest of the five modules that make up the Pratt & Whitney engine that powers the F-35 is pictured in the hold of the USS Wasp during fighter plane testing off the coast of North Carolina May 26, 2105. The newest U.S. warplane did well in nearly two weeks of testing on an amphibious warship, proving it can operate and be serviced at sea, another key step toward a July declaration by the Marine Corps that it is ready for combat use. Picture taken May 26, 2015. REUTERS/Andrea Shalal