Military spokeswoman Elizabeth Mathias said hostile fire
was unlikely to be the cause of the crash because the troops were not receiving fire when the helicopter took off.
The Hostile Fire
Indicator will protect our helicopters so that they can focus on missions and it will also raise people's battlefield awareness," said Bill Ashe, Program Manager at BAE Systems' Survivability and Protection Systems business.
In Washington, Pentagon spokesman Bryan Whitman said preliminary information showed no indication that the aircraft was brought down by hostile fire
, or of a mid-air collision with another aircraft.
US troops have sometimes mistaken this gesture for hostile fire
Central Command claimed its forces were responding to hostile fire
coming from both the Palestine Hotel and the Al-Jazeera office, charges that have been vigorously denied by journalists who were there.
Though the other reporters and I ate with the troops, slept next to them, and endured hostile fire
alongside them, we were professionals, military personnel, and correspondents alike.
Corporal Ian Plank, 31, from Poole, Dorset, was said to have been serving with the Royal Marines Special Boat Service (SBS) when he came under hostile fire
Unconfirmed reports said the twin-rotor aircraft, nicknamed the Sea Knight, suffered mechanical failure and was not downed by hostile fire
brought down one Chinook helicopter on Monday and damaged another, killing seven US troops.
To be eligible, these troops must be directly supporting operations in Afghanistan and must be receiving imminent danger pay or hostile fire
pay for reasons related to the Afghanistan operation.
Some of the 2,000 British soldiers in the 4,500-strong ISAF force in Kabul have come under hostile fire
twice in the last week.
Sgt Nathan Ross Chapman, 31, the first US serviceman to die from hostile fire
, was caught in an ambush close to the Tora Bora cave complex.