(Editor's Note: This story has been updated to reflect the correct number of UH-1N aircraft owned by Air Force Global Strike Command and to clarify which upgrades are part of the service-life extension program.) As the Air Force prepares to choose a helicopter to replace its UH-1N Huey fleet, it is simultaneously moving forward with a service-life extension program for 42 aircraft to keep them airworthy until the new helicopters are delivered. In its fiscal year 2018 budget request,...