( CNN ) -- All six airmen aboard the B-52 bomber that crashed Monday off Guam 's northwest coast were killed , Air Force officials confirmed Wednesday . The B-52H Stratofortress , like this one , was in Guam as part of a four-month rotation . Aboard Raider 21 were Maj. Christopher M. Cooper , 33 ; Maj. Brent D. Williams , 37 ; Capt . Michael K. Dodson , 31 ; 1st Lt. Joshua D. Shepherd , 26 ; 1st Lt. Robert D Gerren , 32 ; and Col. George Martin . The plane crashed about 30 miles northwest of Guam , the Air Force said in a statement . Air Force crews switched from a rescue operation to a recovery operation over the 7,000-square-mile crash site , said Air Force spokeswoman Sgt . Ashleigh Bryant . The bomber was scheduled to fly over crowds celebrating Liberation Day , which commemorates the U.S. capture of Guam from Japan in 1944 , said Capt . Joel Stark , spokesman for Andersen Air Force Base in Guam . The B-52H Stratofortress , based at Barksdale Air Force Base in Louisiana , was in Guam as part of a four-month rotation when it went down about 9:45 a.m. Monday ( 7:45 p.m . ET Sunday ) , Stark said . Martin was a physician and second in command of the medical unit at Andersen and not a member of the crew . There were no weapons or munitions aboard the aircraft , the Air Force said . In February , a B-2 stealth bomber crashed shortly after takeoff from Andersen Air Force Base . Two crew members ejected safely .
NEW : One airman was physician and second in command of the medical unit . Bodies of two airmen found in Pacific Ocean ; four others sought . Bomber was scheduled to fly over crowds celebrating Liberation Day . The B-52H Stratofortress was based at Barksdale Air Force Base in Louisiana .