An official timeline of the Office of Personnel Management breach obtained by FCW pinpoints the hackers' calibrated extraction of data and the government's step-by-step response. It illuminates a sequence of events that lawmakers have struggled to pin down in public hearings with Obama administration officials. The timeline makes clear that the heist of data on 22 million current and former federal employees was one sustained assault rather than two separate intrusions to steal background investigation data and personnel records. The document, which bears the seals of OPM and the Department of Homeland Security, is dated July 14 and was prepared...