The failure of the human wave attacks in earlier years had prompted Iran to develop a better working relationship between the Army and the Revolutionary Guard and to mould the Revolutionary Guard units into a more conventional fighting force. To combat Iraq's use of chemical weapons, Iran began producing an antidote. They also created and fielded their own homemade drones, the Mohajer 1's, fitted with six RPG-7's to launch attacks. They were primarily used in observation, being used for up to 700 sorties.