This aggressive one base build uses a medivac to forgo your opponent's forward bunkers and walled off ramp attacking with marines and hellions.
10 – Supply depot
12 – Barracks
13 – Refinery
17 – Orbital command upgrade
17 – Supply depot
18 – Factory
19 – Reactor on barracks
Constant Marine and Hellion production
21 – Starport
25 – Medivac
At this point you have about 3 hellions and 8 marines to attack with, the key is to use the medivac to lift your units up into your opponent's main base, you can continue pressure and continue rallying units and lifting them into your opponent's base. Hopefully your opponent sustains sufficient economic damage from the attack, after the attack is done you should expand and go for a marine, tank, medivac composition. It is also a possibility to add a tech lab to your starport and produce cloaked banshees to kill damaged SCVs in your opponent's mineral line.
