Only a quarter of US F-35s were fully mission-capable last year as maintenance and parts problems dragged down readiness, watchdog reports

The F-35 is the world's costliest weapons program, and its readiness rates have been continually slipping in recent years. US Marine Corps photo by Sgt. Trent A. Henry Only one in four US F-35 fighters was fully mission-capable las year, according to a new report. The GAO said readiness rates have been decreasing in recent years due to maintenance and spare parts issues. Efforts to improve readiness rates haven't yielded results. The US fleet of F-35 stealth fighters has seen falling readin...