Marines, marauders and medivac dropships/medics (commonly referred to as MMM or 3M) is a StarCraft II terran strategy. Developed by StarCraft II beta testers, it is particularly useful against protoss opponents. It consists of massing infantry units (marines and marauders), researching stimpacks, concussive shells and optionally the ballistic alloy combat shield, and then supporting the army with healing medivac dropships or medics. Such a force easily counters enemy's zealots, stalkers and immortals, and even void rays. The use of medics applies to the Wings of Liberty campaign.