KC-46 Tanker: Air Force Needs to Mature Critical Technologies in New Aerial Refueling System Design, Report to Congressional Addressees [open pdf - 2MB]
From the Highlights: "The KC-46 tanker is among the Air Force's highest acquisition priorities as it is intended to replace one-third of the aging aerial refueling tanker fleet. Aerial refueling--the transfer of fuel from airborne tankers to combat and airlift forces while in flight--is critical to the U.S. military's ability to operate globally. GAO [Government Accountability Office] received a request to review the KC-46 program. In addition, a House Report included a provision for GAO to review the Department of Defense's (DOD) use of contracted aerial refueling services. This report reviews the KC-46 program and assesses: (1) the Air Force and Boeing's steps to address critical deficiencies; (2) the Air Force's plans to conduct a technology readiness assessment and maturation plan for critical technologies; and (3) DOD's actions to address potential aerial refueling gaps, including the use of contracted refueling services. GAO assessed documentation and interviewed officials from the KC-46 program office, Air Force, DOD, and Boeing, among others."
Government Accountability Office: http://www.gao.gov/