The Marine version of the F-35 Joint Strike Fighter, already more than a decade in the making, was facing a crucial question: Could the jet, which can soar well past the speed of sound, land at sea like a helicopter?/…/With a record price tag — potentially in the hundreds of billions of dollars — the jet is likely to become a target for budget cutters. Reining in military spending is on the table as President Obama and Republican leaders in Congress look for ways to avert a fiscal crisis. But no matter what kind of deal is reached in the next few weeks, military analysts expect the Pentagon budget to decline in the next decade as the war in Afghanistan ends and the military is required to do its part to reduce the federal debt.

Todd Harrison, an analyst at the Center for Strategic and Budgetary Assessments, a research group in Washington, said Pentagon officials had little choice but to push ahead, especially after already spending $65 billion on the fighter. “It is simultaneously too big to fail and too big to succeed,” he said. “The bottom line here is that they’ve crammed too much into the program. They were asking one fighter to do three different jobs, and they basically ended up with three different fighters/…/”

Mr. Harrison, the analyst at the budget center, said the willingness to “roll the dice” reflected the peculiar incentives at the Pentagon, where rushing into production creates jobs and locks in political support, even if it allows programs to drift into trouble. Lockheed and its suppliers on the F-35 employ 35,000 workers, with some in nearly every Congressional district.
“The military services want to get the planes as quickly as possible,” Mr. Harrison said. “The defense industry wants to start producing as quickly as possible. But it’s not in the best interest of taxpayers, and it ends up catching up with you.”
Asked who protects the taxpayer, he said, “That’s what the Pentagon’s civilian leadership is supposed to bring.”