The Brief Edwards Air Force Base officials have released the names of the eight military, civilian, and contractor crew members killed in Monday's devastating test flight accident. The Boeing B-52 Stratofortress dropped sharply and crashed halfway down the runway shortly after takeoff while supporting a critical radar modernization test program. The base airfield remains closed as an Interim Safety Investigation Board begins a probe that officials say could take up to six months to complete. Edwards Air Force Base officials on Wednesday released the identities of the eight crew members killed Monday when a B-52 Stratofortress crashed shortly after takeoff during a routine test mission. What we know: Officials said the B-52 bomber took off shortly before noon on Monday under clear skies, heading south-west, but slammed into the ground about halfway down the 15,000-foot runway. Aerial footage revealed compact wreckage with virtually nothing left of the aircraft, leading officials to determine there were no survivors. PREVIOUS COVERAGE: Air Force B-52 bomber crashes in Kern County, 8 presumed dead: Officials The flight was supporting a radar modernization program designed to integrate an Active Electronically Scanned Array (AESA) system to keep the decades-old fleet flying through 2050. Following a 24-hour waiting period after next-of-kin notifications, officials identified the eight fallen Team Edwards members as: Col. Gregory Watson , 53, weapon systems officer, Boeing (Air Force reservist) Lt. Col. Gabriel Estrella , 40, weapon systems officer, Air Force Operational Test and Evaluation Center Retired Lt. Col. Miles Middleton , 50, pilot, Boeing Maj. Alexander Davis , 34, weapon systems officer, 419th Flight Test Squadron Maj. Robert Dee, 40 , pilot, 419th Flight Test Squadron Maj. Brad Hovey, 35 , pilot, 419th Flight Test Squadron Jeromy Smith , 32, flight test engineer, 419th Flight Test Squadron Christopher Rischar, 41, flight test engineer, JT4 contractor What we don't know: The exact cause of the crash has not been determined. While aviation experts point to potent #fox4news #crimewatchdallas