Nine Indian military personnel were killed when two Mil Mi-17 transport helicopters operated by the Indian air force crashed after taking off from Jamnagar air base on 30 August.
The incident occurred at midday, and an inquiry has been ordered to investigate the accident's cause, India's defence ministry said in a statement.
Indian media reports suggest that the two helicopters collided in mid-air.
Jamnagar air base is located in India's western Gujarat province.
The Indian air force had an active fleet of 128 Mi-17s prior to the accident, as recorded by Flightglobal's HeliCAS database.