This site uses google adwords which uses cookies, view google cookie information here. By using this website you accept the use of cookies. NOTE: This website is changing soon :-)
Look at the file called missions.ini in your .\data directory. At the bottom of each mission profile you see a header called 'PVSTART'. That's your starting vehicles. Each number there represents how many of a certain unit you will start with. Be careful when editing this - sometimes (Usually with machine gunners, as far as I can tell), your map will load and a fair chunk of your force will blow up.
Here are a few of the unit places:
(Each number I list represents which number 0 on the list, from left to right. You should have about 44 numbers there)
Now when you begin, you'll have two MCVs (Just in case), the wimpy Crusader is gone, and you have 7 Purifiers, 4 Redeemers and 8 Revelators. You can also change your mission goals, the briefing and some other stuff in that file, though I'd stick to the safe side and just mess with your units.
Remember that if you are reloading a saved game after you've edited the file, you MUST hit escape and go to 'Restart Level' in order for it to work