In January 1966, in an accident now known as the Palomares incident, a B28 nuclear bomb was lost off the coast of Palomares,Spain, after two United States Air Forceaircraft of the Strategic Air Command (SAC), aB-52G Stratofortress bomber and a KC-135A Stratotanker aerial refueling aircraft collided during aerial refueling.
Brashear was serving aboard USS Hoist (ARS-40) when it was dispatched to find and recover the missing bomb for the Air Force. The warhead was found after two and a half months of searching. For his service in helping to retrieve the bomb, Brashear was later awarded the Navy and Marine Corps Medal – the highest Navy award for non-combat heroism.
During the bomb recovery operations on March 23, 1966, a line used for towing broke loose, causing a pipe to strike Brashear's left leg below the knee, nearly shearing it off. He was evacuated to Torrejon Air Base in Spain, then to the USAF Hospital at Wiesbaden Air Base, Germany; and finally to the Naval Hospital in Portsmouth, Virginia. Beset with persistent infection and necrosis, his lower left leg was eventually amputated.Brashear remained at the Naval Regional Medical Center in Portsmouth from May 1966 until March 1967 recovering and rehabilitating from the amputation.
From March 1967 to March 1968, Brashear was assigned to the Harbor Clearance Unit Two, Diving School, preparing for return to full active duty and diving.[6] In April 1968, after a long struggle, Brashear was the first amputee diver to be (re)certified as a U.S. Navy diver. In 1970, he became the first African-American U.S. Navy Master Diver, and served ten more years beyond that, achieving the rating of Master Chief Boatswain's Mate in 1971. Brashear was motivated by his beliefs that "It's not a sin to get knocked down; it's a sin to stay down" and "I ain't going to let nobody steal my dream".