(Editor's Note: This article has been updated to include new information from the Navy and Marine Corps.) The Marine Corps has signed an agreement with the Navy to buy aircraft-carrier variants of the Joint Strike Fighter, a decision that effectively updates a 2003 commitment by the two services to integrate their tactical air forces and dashes the vision held by some senior Marines of a pure fleet of short-takeoff-and-landing variants of the F-35, service officials announced today. Under the...