(CNN) The US military on Thursday identified the two soldiers killed in a helicopter crash in Afghanistan.

Chief Warrant Officer 2 David C. Knadle, 33, of Tarrant, Texas, and Chief Warrant Officer 2 Kirk T. Fuchigami Jr., 25, of Keaau, Hawaii, were killed in the crash, the Pentagon said in a statement Thursday . Both soldiers had been assigned to 1st Battalion, 227th Aviation Regiment, 1st Air Cavalry Brigade, 1st Cavalry Division in Fort Hood, Texas.

The crash happened while the helicopter was "providing security for troops on the ground" in Afghanistan's Logar Province, according to the statement.

On Wednesday, the US Forces Afghanistan press office said "preliminary reports do not indicate (the crash) was caused by enemy fire." The incident remains under investigation.

At least 19 Americans have been killed in combat in Afghanistan in 2019, and there have been more than 2,400 total deaths of US service members since the US first went into Afghanistan in October 2001.

Read More