Bon voyage to cambodia

[ndtschau]

Hello everybody!
I've got a problem in this mission:

I'm inside the VC-Depot close to the ammo-crates where I should get some extra TNT.

But my men aren't able to get to the crate where the TNT should be in.
The only crates they can reach are filled with ammo, machineguns and RPGs.

Can someody tell me if this is a bug or must I really destroy all the tanks with the RPGs (seems to be an impossible mission to me...)

Thanks for your help!