F-22 Raptor - $67 billion
Cost per unit: $412 million
The Pentagon spent nearly $67 billion to design, engineer and deploy 187 F-22s between 1997 and 2012. Twenty years ago, the department planned to buy 648 F-22s for $139 million apiece. But thanks to added modernization costs ultimately soared to $412 million, the Government Accountability Office said. Congress voted in 2009 to halt production, though the Raptor has been given a second chance, flying bombing sorties against the Islamic State and has seen training deployments to Europe.