Unzip to your maps directory and play normally with Starcraft.
The Koprulu Sector is a turbulent place, torn apart by war after war, decimated planets in its wake. It has occured on such a grand scale that sometimes we forget about the individuals who put it all on the line for their cause. Meet Lieutenant Jack Sherall, a Marine in the Terran Dominion whose life has been thrust into the fray, leaving him and everyone around him forever changed. Come and experience the Life of a Marine.
Life of a Marine is a single-player campaign for StarCraft: Brood War. It features seven playable missions and a storyline that brings you down to the world of the Marine who gives himself selflessly for his cause.