Save Empire Earth

I've just started to play EE, and was wondering if there is a way to "lock" buildings and/or units so they are unavailable to be used by any player. For instance, if I wanted to remove the ability to build any aircraft, can I remove the airport or air units from a scenerio or campaign?

only if your playing a scen or campaign that you have made

yes, you can.
it's under the tech thing for each player.