TACOMA, Wash. -

Rangers at Mount Rainier National Park say many climber rescues wouldn't be possible without an Army Reserve Chinook helicopter unit at Joint Base Lewis-McChord.

The News Tribune reports the unit is the 1st Battalion, 214th General Support Aviation Regiment. It has deployed to Iraq and Afghanistan, but it faces some of the toughest conditions on Washington's tallest mountain.

Chief Ranger Chuck Young says Chinook copters allow rescues above 10,000 feet, an altitude that can't be reached by most civilian copters.

The helicopter unit also uses Mount Rainier for training.