The cause of the crash is under investigation, the US Army Military District of Washington said in a statement last evening.
"We are deeply saddened by this loss within our community," said Major General Bradley A Becker, commanding general, Joint Force Headquarters National Capital Region and the US Army Military District of Washington. "Our condolences go out to the families and friends affected by this tragedy, and our team is focused on supporting them during this difficult time."
They are being treated at the R Adams Cowley Shock Trauma Center at the University of Maryland Medical Center in Baltimore.
They were not identified, pending notification of relatives.
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The aircraft was from the 12th Aviation Battalion, stationed at Davison Airfield, Fort Belvoir, Virginia.
Kevin Bowen, who works in the pro shop of the Breton Bay Golf and Country Club, said he saw the helicopter "flying kind of low" and then "saw it spinning" before it went down between the third and fourth holes of the course in Leonardtown, about 97 kilometers southeast of Washington, DC.
"I was outside in my front yard when I saw the helicopter come over right across the street from my house. I saw pieces actually falling off the helicopter," she said.
Harper said she didn't see smoke or flames, "just pieces falling out of the sky."
Shortly after, emergency vehicles started rolling in, she said.
Army investigators were driving around the course in golf carts last evening, placing evidence markers near pieces of debris.
A team from the Army Combat Readiness Center, in Fort Rucker, Alabama, will be on site today to conduct the investigation, the Army's statement said.
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