Hmm...looks like it's not listed in xgamer's guide...might be a bad sign...or he's just a slacker...
To the tag: From the description, it looks rather simple. So if you tried it, and it didn't work yet, it's rather probable that it's obsolete. Might be risidual from Red Alert or something. Or weird stuff from the betas.
I know it's a stupid question, but just to be sure: You did test this in a multiplayer-game, didn't you?