Terran Strategy: MMM: Early Marauder Aggression

(10) Supply Depot
(12) Barracks
(13) Refinery
(16) Orbital Command
(17) Tech Lab - Barracks
(20) Concussive Shell
(20) Barracks
(28) Refinery
(28) Reactor - Barracks
(31) Stim Pack
(37) Factory
(45) Reactor - Factory
(45) Starport

Build two supply depots at the entrance to your base then block off the entrance with a barracks then start producing marines. While you were doing this you should have harvested enough minerals to create a refinery, gather enough vespene to create an orbital command. After the orbital command is built add a tech lab to your barracks and start producing marauders and researching concussive shells. Build one more Barracks, then build an extra refinery to increase your vespene collection. After you have gathered enough vespene add a reactor to your second barracks, the begin training marines. TIP:Keep training scvs. Make sure your still training marauders. Research stim packs. Start building a factory, then once completed add a reactor. Finally build a starport,then start producing medivacs. Then use at least 3 medivacs 5 marauders and your choice of marines and attack your opponents base.

This works well against Protoss