Ant Missions:
The sheet of morse code means the following...
When the game loads, hold shift & left-click on the speaker
located at the top right hand corner.
Queen Ant:
On the last Ant mission (very hard to get to!), save your game and
then load up a "build - a - base" mission. Sell a couple of buildings and
you will hear "New Construction Options". You will be able to build a queen
ant.
Tesla Tanks in Skirmish:
When you enter Red Alert, click on the New Missions bar. Then, click
on the mission The Legacy Of Tesla. Build all the required buildings until
you can build the Tesla Tank. Then abort the mission. Now click on Multi-player
Games. Select Skirmish Mode. After you start a game, you should be able
to build Tesla Tanks.