Forty-one bodies had been pulled from the Potomac River as of Friday afternoon, including 28 that had been positively identified.
The name of one of the three soldiers killed in the plane crash in Washington is not being released.
The army identified two of the soldiers killed when an American Airlines jet and a military helicopter collided mid-air as Staff Sergeant Ryan Austin O’Hara and Chief Warrant Officer 2 Andrew Loyd Eaves.
However, it made the unusual decision, at the request of the family, not to release the name of the third soldier.
Meanwhile, investigators announced the black box from the Black Hawk helicopter has been recovered.
They are reviewing the flight data recorder along with two from the plane as they probe the cause of the devastating crash.
Forty-one bodies had been pulled from the river as of Friday afternoon, including 28 that had been positively identified, Washington DC fire chief John Donnelly Sr said at a news conference.
He said next of kin notifications had been made to 18 families, and that he expects that all 67 of the bodies of the dead will eventually be recovered.
“It’s been a tough response for a lot of our people,” Mr Donnelly said, noting that more than 300 responders were taking part in the effort at any one time.
Investigators have already recovered the cockpit voice recorder and flight data recorder of the American Airlines plane, which struck the helicopter as the plane was coming in for a landing at the airport next to Washington.
Officials are scrutinising a range of factors in what National Transportation Safety Board chairwoman Jennifer Homendy has called an “all-hands-on-deck event”.
Investigators are examining the actions of the military pilot as well as air traffic control, after the helicopter apparently flew into the jet’s path.
Air crash investigations normally take 12-18 months, and investigators told reporters on Thursday that they would not speculate on the cause.
It has been suggested the helicopter exceeded an altitude limit.
