When I meet Rubble at the Gunnery Range, he tells me to practice and then meet him at Covert Ops. But when I go to Covert Ops, the door remains closed. What am I doing wrong?

could be one of the following.

i think you have to kill all the practice dummies.

or

load up and shoot a few rockets

if either of those dont work, im stumped as wel

I just had to reload the game from before I entered that level. I never fired a shot from the rocket launcher or killed any dummies. I found a thread relating to just that problem in another forum. But thanx anyway.