The crew was practicing how to land the aircraft 15 miles northeast of Yuma when "something went wrong," said Michelle Dee, a spokeswoman for Naval Air Facility El Centro in California.
The people aboard the Chinook had non-life-threatening injuries and were sent to the hospital for evaluations as a precaution, Dee said. The helicopter sustained damage but Dee said she didn't know the extent of the damages.
The cause of the mishap was under investigation.
The Chinook was operating out of the naval base in California's Imperial Valley.
