UPDATED with Marine Corps data CAPITOL HILL: More than 60 percent of Navy and Marine Corps strike fighters are out of service, the Navy confirmed today. While 62 percent of fighters are effectively grounded, the overall figure for all naval aircraft is 53 percent. [UPDATE: With some of the oldest fighter jets in service, Marine Corps figures are even worse: In December, 74 percent of Marine F-18 Hornets were not ready for combat — 208 of 280 aircraft; see below for details.]