The around-the-clock effort failed to locate any sign of the 12 service members despite five days of searching by several agencies.
Officials said at a late afternoon news conference that the search would be suspended at sundown and the Marine Corps would transition to "recovery and salvage" efforts. A memorial is tentatively planned for Friday at Marine Corps Base Hawaii in Kaneohe Bay.
"The decision to suspend the search without finding survivors is particularly difficult," said Capt. James Jenkins, chief of staff and acting commander of the Coast Guard 14th District in Honolulu.
The Marines were alerted when the CH-53E helicopters carrying six crew members each failed to return to their base at Kaneohe Bay following a nighttime training mission. Hours later, a Coast Guard helicopter and C-130 airplane spotted debris 2 1/2 miles (four kilometers) off of Oahu.
The crash was near the north shore, but the search area spanned from the western coast of Oahu to the northeast corner of the island.
The transport helicopters were part of the 1st Marine Aircraft Wing at Marine Corps Base Hawaii. Known as Super Stallions, they are the US military's largest helicopter, capable of carrying a light armored vehicle, 16 tons of cargo or a team of combat-equipped Marines, according to a Marine Corps website.
The Marine Corps will strive to "discover all of the facts" surrounding the crash, said Brig. Gen. Russell Sanborn, commanding general of the 1st Marine Aircraft Wing.
They will continue the recovery of any debris and "any other remains that may discovered," he said, "so that we can give closure to those families that are still out there that still want that final piece of the puzzle.
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