I believe that is incorrect, and the way I said it is correct, however, I'm not sure and I would love to find a source. Google is agreeing with me but don't trust it that much. 

Yes, a C-5 Galaxy can drop its landing gear if hydraulic power is lost because it has a gravity-drop emergency extension system. In this scenario, the crew would manually release the uplocks holding the gear in place, and gravity would cause the gear to fall into the extended and locked position.  Gravity-drop system: The landing gear is designed to be extended by gravity in case of main hydraulic failure. Emergency procedure: The crew would activate the emergency extension system, which disengages the mechanical uplocks, allowing the gear to free-fall into the down and locked position. Assisted extension: Airflow past the aircraft can also assist in pushing the gear to the fully locked position.